Pub Date : 2025-02-10DOI: 10.1016/j.ijft.2025.101119
Zaid Allal , Hassan N. Noura , Ola Salman , Flavien Vernier , Khaled Chahine
Adopting machine learning (ML) in hydrogen systems is a promising approach that enhances the efficiency, reliability, and sustainability of hydrogen power systems and revolutionizes the hydrogen energy sector to optimize energy usage/management and promote sustainability. This study explores hydrogen energy systems, including production, storage, and applications, while establishing a connection between machine learning solutions and the challenges these systems face. The paper provides an in-depth review of the literature, examining not only ML techniques but also optimization algorithms, evaluation methods, explainability techniques, and emerging technologies. By addressing these aspects, we highlight the key factors of new technologies and their potential benefits across the three stages of the hydrogen value chain. We also present the advantages and limitations of applying ML models in this field, offering recommendations for their optimal use. This comprehensive and precise work serves as the most current and complete examination of ML applications within the hydrogen value chain, providing a solid foundation for future research across all stages of the hydrogen industry.
{"title":"A review on machine learning applications in hydrogen energy systems","authors":"Zaid Allal , Hassan N. Noura , Ola Salman , Flavien Vernier , Khaled Chahine","doi":"10.1016/j.ijft.2025.101119","DOIUrl":"10.1016/j.ijft.2025.101119","url":null,"abstract":"<div><div>Adopting machine learning (ML) in hydrogen systems is a promising approach that enhances the efficiency, reliability, and sustainability of hydrogen power systems and revolutionizes the hydrogen energy sector to optimize energy usage/management and promote sustainability. This study explores hydrogen energy systems, including production, storage, and applications, while establishing a connection between machine learning solutions and the challenges these systems face. The paper provides an in-depth review of the literature, examining not only ML techniques but also optimization algorithms, evaluation methods, explainability techniques, and emerging technologies. By addressing these aspects, we highlight the key factors of new technologies and their potential benefits across the three stages of the hydrogen value chain. We also present the advantages and limitations of applying ML models in this field, offering recommendations for their optimal use. This comprehensive and precise work serves as the most current and complete examination of ML applications within the hydrogen value chain, providing a solid foundation for future research across all stages of the hydrogen industry.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101119"},"PeriodicalIF":0.0,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-09DOI: 10.1016/j.ijft.2025.101122
Muhammad Ishaq, Ibrahim Dincer
Solid oxide fuel cell (SOFC) releases significant high-temperature thermal energy during its operational mode. If this heat is not managed properly, it leads to thermal stresses, material shocks, and degradation. To effectively utilize such a high-temperature heat, this work presents a thermodynamic analysis and environmental assessment of a novel concept that synergistically integrates a benchmark SOFC with a four-step hybrid Cu-Cl thermochemical cycle. The developed system incorporates a SOFC unit for electricity generation, an afterburner for the complete oxidation of unreacted fuel (H2, CO), a thermochemical cycle for utilizing high-temperature heat, a supporting Rankine Cycle (SRC), and an H2 and CO2 compression unit. The system is simulated by solving mass, energy, and exergy balances at steady-state conditions. Pinch point analysis is conducted using MATLAB to assess the thermodynamic feasibility of H2 production. Furthermore, the specific primary energy consumption per unit of CO2 avoided (SPECCA) is calculated to assess the system's environmental impacts. It is found that the CO2 and H2 compression train exhibit an overall exergy destruction of 5.83 kJ/mol of CO2 and 5.98 kJ/mol of H2 respectively. The thermolysis reactor of the Cu-Cl cycle carries the highest exergetic losses, with a share of 34.39%. The system exhibits a SPECCA value of 8.27 with 0.114 MJ/kg CO2, considering the options with and without the Cu-Cl thermochemical cycle. The system's overall energy and exergy efficiencies are also 64.45% and 59.07% respectively.
{"title":"Process development and simulation of a novel solar energy plant integrated with solid oxide fuel cell, hydrogen, heat recovery and carbon capture systems","authors":"Muhammad Ishaq, Ibrahim Dincer","doi":"10.1016/j.ijft.2025.101122","DOIUrl":"10.1016/j.ijft.2025.101122","url":null,"abstract":"<div><div>Solid oxide fuel cell (SOFC) releases significant high-temperature thermal energy during its operational mode. If this heat is not managed properly, it leads to thermal stresses, material shocks, and degradation. To effectively utilize such a high-temperature heat, this work presents a thermodynamic analysis and environmental assessment of a novel concept that synergistically integrates a benchmark SOFC with a four-step hybrid Cu-Cl thermochemical cycle. The developed system incorporates a SOFC unit for electricity generation, an afterburner for the complete oxidation of unreacted fuel (H<sub>2</sub>, CO), a thermochemical cycle for utilizing high-temperature heat, a supporting Rankine Cycle (SRC), and an H<sub>2</sub> and CO<sub>2</sub> compression unit. The system is simulated by solving mass, energy, and exergy balances at steady-state conditions. Pinch point analysis is conducted using MATLAB to assess the thermodynamic feasibility of H<sub>2</sub> production. Furthermore, the specific primary energy consumption per unit of CO<sub>2</sub> avoided (SPECCA) is calculated to assess the system's environmental impacts. It is found that the CO<sub>2</sub> and H<sub>2</sub> compression train exhibit an overall exergy destruction of 5.83 kJ/mol of CO<sub>2</sub> and 5.98 kJ/mol of H<sub>2</sub> respectively. The thermolysis reactor of the Cu-Cl cycle carries the highest exergetic losses, with a share of 34.39%. The system exhibits a SPECCA value of 8.27 with 0.114 MJ/kg CO<sub>2</sub>, considering the options with and without the Cu-Cl thermochemical cycle. The system's overall energy and exergy efficiencies are also 64.45% and 59.07% respectively.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101122"},"PeriodicalIF":0.0,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-08DOI: 10.1016/j.ijft.2025.101131
Muhammad Waseem , Ihab Omar , Muhammad Jawad , Taoufik Saidani , Qasem M. Al-Mdallal
This paper investigates the influence of chemical reactions and variable magnetic field on three dimensional Oldroyd B micropolar nanofluids subjected to exponentially stretching sheet in the presence of motile microbes. The study incorporates several significant physical phenomena, including Cattaneo-Christov heat thermal radiation chemical reaction kinetics and Darcy-Forchheimer effects. A particularly novel aspect of PST (prescribed surface temperature) and PHF (prescribed heat flux) are taken into account. The governing nonlinear PDEs of Oldroyd B fluids with thermophoretic diffusion and Brownian motion are transformed in to nonlinear ODEs via similarity functions. The resulting set of nonlinear ODEs are solved numerically via MATLAB platform and compared the results with published literature through bvp4c built-in code for better agreement. The results of on different parameters like Peclet number, Forchheimer number, thermal relaxation time, chemical reaction, Prandtl number, Schmidt number, porosity parameter, heat source coefficient and magnetic parameter on Skin friction, Nusselt number, Sherwood number and motile density number are discussed in detail through graphs, tables and literature. It is declared that Skin friction coefficients decline for developed values of magnetic parameter, porosity parameter.and viscoelastic parameter. The thermal boundary layer thickness decreases with growing value of Prandtl number. The findings have significant implications for industrial and engineering processes where heat transfer is major issue.
{"title":"Impact of Cattaneo-Christov heat and surface temperature on viscoelastic non-newtonian micropolar nanofluids: Darcy exponential sheet flow with planktonic microorganisms","authors":"Muhammad Waseem , Ihab Omar , Muhammad Jawad , Taoufik Saidani , Qasem M. Al-Mdallal","doi":"10.1016/j.ijft.2025.101131","DOIUrl":"10.1016/j.ijft.2025.101131","url":null,"abstract":"<div><div>This paper investigates the influence of chemical reactions and variable magnetic field on three dimensional Oldroyd B micropolar nanofluids subjected to exponentially stretching sheet in the presence of motile microbes. The study incorporates several significant physical phenomena, including Cattaneo-Christov heat<span><math><mo>,</mo></math></span> thermal radiation<span><math><mo>,</mo></math></span> chemical reaction kinetics<span><math><mo>,</mo></math></span> and Darcy-Forchheimer effects. A particularly novel aspect of PST (prescribed surface temperature) and PHF (prescribed heat flux) are taken into account. The governing nonlinear PDEs of Oldroyd B fluids with thermophoretic diffusion and Brownian motion are transformed in to nonlinear ODEs via similarity functions. The resulting set of nonlinear ODEs are solved numerically via MATLAB platform and compared the results with published literature through bvp4c built-in code for better agreement. The results of on different parameters like Peclet number, Forchheimer number, thermal relaxation time, chemical reaction, Prandtl number, Schmidt number, porosity parameter, heat source coefficient and magnetic parameter on Skin friction, Nusselt number, Sherwood number and motile density number are discussed in detail through graphs, tables and literature. It is declared that Skin friction coefficients decline for developed values of magnetic parameter<span><math><mrow><mspace></mspace><mi>M</mi></mrow></math></span>, porosity parameter<span><math><mrow><mspace></mspace><msub><mi>K</mi><mn>1</mn></msub></mrow></math></span>.and viscoelastic parameter<span><math><mrow><mspace></mspace><msub><mi>K</mi><mn>2</mn></msub></mrow></math></span>. The thermal boundary layer thickness decreases with growing value of Prandtl number. The findings have significant implications for industrial and engineering processes where heat transfer is major issue.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101131"},"PeriodicalIF":0.0,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.ijft.2025.101115
Kevin Fontaine , Takeshi Yasunaga , Yasuyuki Ikegami
Ocean Thermal Energy Conversion is a steady source of renewable energy that uses the natural temperature gradient within the ocean but requires large and expensive heat exchangers, considerably contributing to the overall cost. Thus, this study focuses on finding optimum herringbone plate heat exchangers geometry leading to the highest net power output to heat transfer area ratio . A method to assess and maximize is developed, applied to a heat exchanger geometry from the literature, before being used to find optimum geometries , which resulted in a 33.8% increase in compared with the geometry used as reference, at chevron angles of 48.7° and 30°, mean channel spacing of 3.7 and 1.5 mm, corrugation pitches of 15 and 6.0 mm, and width to length ratios of 0.6 and 1 for the evaporator and condenser, respectively. The effect of each parameter is also analyzed showing a high impact of evaporator mean channel spacing and corrugation pitch and identified possible geometries for further studies. A sensitivity analysis revealed a design gross power with, granted a sufficient pipe diameter, negligible effect on optimum geometries, while the heat source temperature difference yielded two possible optimum for the condenser and a potential single one for the evaporator.
{"title":"Ocean thermal energy conversion net power maximization for the optimization of plate heat exchanger geometry","authors":"Kevin Fontaine , Takeshi Yasunaga , Yasuyuki Ikegami","doi":"10.1016/j.ijft.2025.101115","DOIUrl":"10.1016/j.ijft.2025.101115","url":null,"abstract":"<div><div>Ocean Thermal Energy Conversion is a steady source of renewable energy that uses the natural temperature gradient within the ocean but requires large and expensive heat exchangers, considerably contributing to the overall cost. Thus, this study focuses on finding optimum herringbone plate heat exchangers geometry leading to the highest net power output to heat transfer area ratio <span><math><mrow><mo>(</mo><msub><mrow><mi>w</mi></mrow><mrow><mi>n</mi><mi>e</mi><mi>t</mi></mrow></msub><mo>)</mo></mrow></math></span>. A method to assess and maximize <span><math><msub><mrow><mi>w</mi></mrow><mrow><mi>n</mi><mi>e</mi><mi>t</mi></mrow></msub></math></span> is developed, applied to a heat exchanger geometry from the literature, before being used to find optimum geometries , which resulted in a 33.8% increase in <span><math><msub><mrow><mi>w</mi></mrow><mrow><mi>n</mi><mi>e</mi><mi>t</mi></mrow></msub></math></span> compared with the geometry used as reference, at chevron angles of 48.7° and 30°, mean channel spacing of 3.7 and 1.5 mm, corrugation pitches of 15 and 6.0 mm, and width to length ratios of 0.6 and 1 for the evaporator and condenser, respectively. The effect of each parameter is also analyzed showing a high impact of evaporator mean channel spacing and corrugation pitch and identified possible geometries for further studies. A sensitivity analysis revealed a design gross power with, granted a sufficient pipe diameter, negligible effect on optimum geometries, while the heat source temperature difference yielded two possible optimum for the condenser and a potential single one for the evaporator.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101115"},"PeriodicalIF":0.0,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.ijft.2025.101114
Md. Mehedi Hasan , M.J. Uddin , Salah A. Faroughi
Nanofluids are highly effective in optimizing thermal management in engineering systems. The complex and multifaceted properties of nanofluids require in-depth exploration that transcends their immediate technological and environmental applications. The exothermic chemical reactions and fundamental attributes of nanofluids have intricate mechanisms to advance flow and heat transfer. To understand the mechanisms and challenges associated with chemical reactions in nanofluids, this study investigates the flow dynamics and heat transfer in a nanofluid-filled annulus formed between a square and a circle, considering the effects of radiative heat flux, magnetohydrodynamics (MHD), and exothermic chemical reactions governed by Arrhenius kinetics. The finite element method is employed to solve the governing equations, and the accuracy of the numerical scheme is confirmed against published works. The distribution of velocity magnitude, isotherms, vorticity function, and Nusselt number are examined across a wide range of critical parameters for the copper oxide-water nanofluid. The current study also displays the heat transfer enhancement for 42 nanofluids. The results indicate that, for the copper oxide-water nanofluid, both the thermal Rayleigh number and the exothermic chemical reaction parameter significantly impact the convective flow. The average Nusselt number exhibits an increasing trend with rising Frank–Kamenetskii and Rayleigh numbers but follows a decreasing pattern with an increase in the radiation parameter. Higher Frank–Kamenetskii numbers, in conjunction with reduced radiation parameters, significantly enhance heat transfer. The Nusselt number decreases as the magnetic field intensity and the radius of the inner circle of the annulus increase. The optimal average Nusselt number is achieved with a magnetic field orientation and a nanoparticle volume fraction of 3%. Copper oxide-water nanofluid shows a slightly higher average Nusselt number than the other nanofluids studied.
{"title":"Magnetohydrodynamic nanofluids flow and heat transfer with radiative heat flux and exothermic chemical reactions","authors":"Md. Mehedi Hasan , M.J. Uddin , Salah A. Faroughi","doi":"10.1016/j.ijft.2025.101114","DOIUrl":"10.1016/j.ijft.2025.101114","url":null,"abstract":"<div><div>Nanofluids are highly effective in optimizing thermal management in engineering systems. The complex and multifaceted properties of nanofluids require in-depth exploration that transcends their immediate technological and environmental applications. The exothermic chemical reactions and fundamental attributes of nanofluids have intricate mechanisms to advance flow and heat transfer. To understand the mechanisms and challenges associated with chemical reactions in nanofluids, this study investigates the flow dynamics and heat transfer in a nanofluid-filled annulus formed between a square and a circle, considering the effects of radiative heat flux, magnetohydrodynamics (MHD), and exothermic chemical reactions governed by Arrhenius kinetics. The finite element method is employed to solve the governing equations, and the accuracy of the numerical scheme is confirmed against published works. The distribution of velocity magnitude, isotherms, vorticity function, and Nusselt number are examined across a wide range of critical parameters for the copper oxide-water nanofluid. The current study also displays the heat transfer enhancement for 42 nanofluids. The results indicate that, for the copper oxide-water nanofluid, both the thermal Rayleigh number and the exothermic chemical reaction parameter significantly impact the convective flow. The average Nusselt number exhibits an increasing trend with rising Frank–Kamenetskii and Rayleigh numbers but follows a decreasing pattern with an increase in the radiation parameter. Higher Frank–Kamenetskii numbers, in conjunction with reduced radiation parameters, significantly enhance heat transfer. The Nusselt number decreases as the magnetic field intensity and the radius of the inner circle of the annulus increase. The optimal average Nusselt number is achieved with a <span><math><mrow><mn>45</mn><mo>°</mo><mo>−</mo><mn>45</mn><mo>°</mo><mo>−</mo><mn>90</mn><mo>°</mo></mrow></math></span> magnetic field orientation and a nanoparticle volume fraction of 3%. Copper oxide-water nanofluid shows a slightly higher average Nusselt number than the other nanofluids studied.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101114"},"PeriodicalIF":0.0,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.ijft.2025.101130
S. Manjunatha , J. Santhosh Kumar , Khalil Ur Rehman , Wasfi Shatanawi , S.V.K. Varma
A wide variety of heat transfer applications employ ferrofluids. These include heat exchangers, materials research, and a host of other industries, such as food processing, solar trough collectors, and aerospace engineering. The main goal of this study is to investigate how fluid moves through a porous medium stretched across a Casson ferrofluid bilinear stretching surface, accounting for the effects of slip and magnetic fields. This study takes into account factors such as thermal radiation, heat source/sink, first-order chemical reactions, Soret, and Dufour effects. Similarity transformations convert the flow model's governing nonlinear coupled partial differential equations into ordinary coupled differential equations. The results are obtained using the time-saving bvp4c approach in MATLAB along with the shooting technique and presented in graphs and tables. The derived quantities, namely skin friction, Nusselt number, and Sherwood number at the stretching surface, are also computed. The effects of various parameters on flow-derived quantities have been analyzed and discussed. The momentum boundary layer drops as the Casson parameter rises. As the magnetic parameter raises, the fluid velocity drops, while the fluid temperature exhibits the opposite phenomenon. As radiation and heat sources increase, the temperature rises, whereas the Dufour effect leads to the opposite outcome. The adjusted R-squared and R-squared for skin friction achieve a value of 99.92 %. Compared to the Dufour effect, the Nusselt number is more affected by the heat source and thermal radiation parameter. Some important contributions include discussing response surface methods and studying the complex connections between Casson fluid, porosity, and the stretching ratio parameter.
{"title":"Thermal radiation and thermo-diffusion in Casson-ferrofluid over a magnetized porous surface: RSM analysis","authors":"S. Manjunatha , J. Santhosh Kumar , Khalil Ur Rehman , Wasfi Shatanawi , S.V.K. Varma","doi":"10.1016/j.ijft.2025.101130","DOIUrl":"10.1016/j.ijft.2025.101130","url":null,"abstract":"<div><div>A wide variety of heat transfer applications employ ferrofluids. These include heat exchangers, materials research, and a host of other industries, such as food processing, solar trough collectors, and aerospace engineering. The main goal of this study is to investigate how fluid moves through a porous medium stretched across a Casson ferrofluid bilinear stretching surface, accounting for the effects of slip and magnetic fields. This study takes into account factors such as thermal radiation, heat source/sink, first-order chemical reactions, Soret, and Dufour effects. Similarity transformations convert the flow model's governing nonlinear coupled partial differential equations into ordinary coupled differential equations. The results are obtained using the time-saving bvp4c approach in MATLAB along with the shooting technique and presented in graphs and tables. The derived quantities, namely skin friction, Nusselt number, and Sherwood number at the stretching surface, are also computed. The effects of various parameters on flow-derived quantities have been analyzed and discussed. The momentum boundary layer drops as the Casson parameter rises. As the magnetic parameter raises, the fluid velocity drops, while the fluid temperature exhibits the opposite phenomenon. As radiation and heat sources increase, the temperature rises, whereas the Dufour effect leads to the opposite outcome. The adjusted R-squared and R-squared for skin friction achieve a value of 99.92 %. Compared to the Dufour effect, the Nusselt number is more affected by the heat source and thermal radiation parameter. Some important contributions include discussing response surface methods and studying the complex connections between Casson fluid, porosity, and the stretching ratio parameter.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101130"},"PeriodicalIF":0.0,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.ijft.2025.101129
Noor Ahmad Mohammad, Ayesha Rashed Saif Rashed Alsalmi, Nour Mamoun Awad, Yihui Ma, S. Saranya, Qasem M. Al-Mdallal
In order to analyze fluid flow over a contracting permeable cylinder, this study provides a solution to Buongiorno's model based on fractional derivatives. We attempt to model the complex behavior of heat and mass transfer using fractional calculus, which is not possible with the traditional models based on integer order. Both thermophoresis and Brownian motion contributions are included in the modified Buongiorno model, which enhances the study of fluids containing nanoparticles deposited using over-contracting cylinders. In the following, we formulate and solve the governing equations under appropriate boundary conditions using the conformable fractional derivative. The appropriate transformations are used to convert the governing system of PDEs into ODEs. The Iterative Power Series Technique (IPS) with a simple firing strategy is selected to demonstrate the numerical solution of the problem. The analysis makes use of a number of significant figures, such as the Schmidt number, fractional order, unsteadiness, Brownian motion, and thermophoresis. It's interesting to note that a higher velocity profile with larger fractional parameter values indicates that the fractional derivatives provide more control over flow behavior. Also, Increasing the fractional order parameter causes a drop-in concentration and temperature profiles, which is associated with the effect of fractional derivatives on mass and energy transfer.
{"title":"Application of fractional derivative in Buongiorno's model for enhanced fluid flow and heat transfer analysis over a permeable cylinder","authors":"Noor Ahmad Mohammad, Ayesha Rashed Saif Rashed Alsalmi, Nour Mamoun Awad, Yihui Ma, S. Saranya, Qasem M. Al-Mdallal","doi":"10.1016/j.ijft.2025.101129","DOIUrl":"10.1016/j.ijft.2025.101129","url":null,"abstract":"<div><div>In order to analyze fluid flow over a contracting permeable cylinder, this study provides a solution to Buongiorno's model based on fractional derivatives. We attempt to model the complex behavior of heat and mass transfer using fractional calculus, which is not possible with the traditional models based on integer order. Both thermophoresis and Brownian motion contributions are included in the modified Buongiorno model, which enhances the study of fluids containing nanoparticles deposited using over-contracting cylinders. In the following, we formulate and solve the governing equations under appropriate boundary conditions using the conformable fractional derivative. The appropriate transformations are used to convert the governing system of PDEs into ODEs. The Iterative Power Series Technique (IPS) with a simple firing strategy is selected to demonstrate the numerical solution of the problem. The analysis makes use of a number of significant figures, such as the Schmidt number, fractional order, unsteadiness, Brownian motion, and thermophoresis. It's interesting to note that a higher velocity profile with larger fractional parameter values indicates that the fractional derivatives provide more control over flow behavior. Also, Increasing the fractional order parameter causes a drop-in concentration and temperature profiles, which is associated with the effect of fractional derivatives on mass and energy transfer.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101129"},"PeriodicalIF":0.0,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-06DOI: 10.1016/j.ijft.2025.101125
P.J. Murphy , S. Alimohammadi , S.M. O'Shaughnessy
A wall-bounded dual jet is formed through combining a wall jet, flowing directly adjacent to a solid wall, with a parallel, co-flowing offset jet. The combination of a wall and offset jet in this manner is commonly encountered across many industrial applications, such as electronics cooling, wastewater evacuation, and noise suppression technologies, despite remaining relatively misunderstood across the published literature. This study aims to contribute to the available dual jet experimental data and further fundamental knowledge of dual jet flows and their accompanying heat transfer characteristics. The primary objective of this experimental investigation is to analyse the effect of varying the separation distance between the wall and offset jets, i.e., the offset ratio (OR), on the dual jet flow and heat transfer behaviour, therefore providing the very first experimental dataset relating to a dual jet for varying OR. For this investigation, a uniform heat flux of 1670 W/m2 is applied to the bounding wall for 5500 ≤ Re ≤ 12,000 and 1 ≤ OR ≤ 7, while the velocity ratio is maintained at a constant value of 1. This is achieved through a two-part experimental investigation, which separately adopts infrared thermography and particle image velocimetry techniques to respectively capture the heat transfer and flow characteristics. The results reveal a strong dependence on OR near the jet exit, while the flow characteristics remain generally unaffected further downstream. Increasing OR leads to a growth in the recirculation region, therefore increasing the streamwise position of the merge point. This consequentially moves the respective locations of the local minimum and maximum values in the characteristic local Nusselt number (Nux) profiles further downstream, while also inducing a general decline in the surface-averaged Nusselt number. Distinct differences in the observed flow and heat transfer behaviour are noted for OR ≤ 2 and OR ≥ 3, where lower OR values produce a unique ‘peaking’ phenomenon in the Nux profile that becomes more exaggerated for higher Re values.
{"title":"Experimental investigation of the effect of the offset ratio on the flow characteristics and heat transfer behaviour of a wall-bounded dual jet flow","authors":"P.J. Murphy , S. Alimohammadi , S.M. O'Shaughnessy","doi":"10.1016/j.ijft.2025.101125","DOIUrl":"10.1016/j.ijft.2025.101125","url":null,"abstract":"<div><div>A wall-bounded dual jet is formed through combining a wall jet, flowing directly adjacent to a solid wall, with a parallel, co-flowing offset jet. The combination of a wall and offset jet in this manner is commonly encountered across many industrial applications, such as electronics cooling, wastewater evacuation, and noise suppression technologies, despite remaining relatively misunderstood across the published literature. This study aims to contribute to the available dual jet experimental data and further fundamental knowledge of dual jet flows and their accompanying heat transfer characteristics. The primary objective of this experimental investigation is to analyse the effect of varying the separation distance between the wall and offset jets, <em>i.e.,</em> the offset ratio (<em>OR</em>), on the dual jet flow and heat transfer behaviour, therefore providing the very first experimental dataset relating to a dual jet for varying <em>OR</em>. For this investigation, a uniform heat flux of 1670 <em>W</em>/<em>m</em><sup>2</sup> is applied to the bounding wall for 5500 ≤ <em>Re</em> ≤ 12,000 and 1 ≤ <em>OR</em> ≤ 7, while the velocity ratio is maintained at a constant value of 1. This is achieved through a two-part experimental investigation, which separately adopts infrared thermography and particle image velocimetry techniques to respectively capture the heat transfer and flow characteristics. The results reveal a strong dependence on <em>OR</em> near the jet exit, while the flow characteristics remain generally unaffected further downstream. Increasing <em>OR</em> leads to a growth in the recirculation region, therefore increasing the streamwise position of the merge point. This consequentially moves the respective locations of the local minimum and maximum values in the characteristic local Nusselt number (<em>Nu<sub>x</sub></em>) profiles further downstream, while also inducing a general decline in the surface-averaged Nusselt number. Distinct differences in the observed flow and heat transfer behaviour are noted for <em>OR</em> ≤ 2 and <em>OR</em> ≥ 3, where lower <em>OR</em> values produce a unique ‘peaking’ phenomenon in the <em>Nu<sub>x</sub></em> profile that becomes more exaggerated for higher <em>Re</em> values.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101125"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As previously mentioned, the solar power tower (SPT) system has a lot of irreversibilities that are difficult to avoid. Therefore, a new, effective power producing unit needs to be constructed in order to enhance the SPT plant's performance. The current study established an entirely novel combined cycle for the SPT plant. The regenerative organic Rankine cycle (RORC) was used for waste heat recovery, and the helium Brayton cycle (HBC) was considered as the topping cycle. Energy, exergy, and exergoeconomic assessments of the proposed power plant, was performed numerically using engineering equation solver software. Additionally, parametric analysis was carried out along with the short working fluid selection analysis. It was concluded that thermal, exergy efficiency, and power output of the proposed power plant (SPT-HBC-RORC) were improved by 19.97 %, 19.95 %, and 19.96 %, respectively, compared to the conventional solar plant (SPT-HBC). However, plant total cost was increased by 11.61 %. Finally, the proposed power plant yielded power output, exergy efficiency, thermal efficiency, and levelized cost of electricity (LCOE) values of 19,918 kW, 41.36 %, 38.62 %, and 43.23 $/MWh, respectively. The fluid R1233zd(E) was recommended as the best-performing fluid thermodynamically. The suggested combination cycle outperformed the Rankine cycle and supercritical CO₂ cycle power production systems based on SPT, according to a comparison with earlier research. Additionally, the proposed combined cycle is more efficient than the SPT-based combined HBC-basic ORC system.
{"title":"Exergoeconomic, thermodynamic and working fluid selection analysis of a novel combined Brayton cycle-regenerative organic Rankine cycle for solar application","authors":"Achintya Sharma , Anoop Kumar Shukla , Onkar Singh , Meeta Sharma","doi":"10.1016/j.ijft.2025.101127","DOIUrl":"10.1016/j.ijft.2025.101127","url":null,"abstract":"<div><div>As previously mentioned, the solar power tower (SPT) system has a lot of irreversibilities that are difficult to avoid. Therefore, a new, effective power producing unit needs to be constructed in order to enhance the SPT plant's performance. The current study established an entirely novel combined cycle for the SPT plant. The regenerative organic Rankine cycle (RORC) was used for waste heat recovery, and the helium Brayton cycle (HBC) was considered as the topping cycle. Energy, exergy, and exergoeconomic assessments of the proposed power plant, was performed numerically using engineering equation solver software. Additionally, parametric analysis was carried out along with the short working fluid selection analysis. It was concluded that thermal, exergy efficiency, and power output of the proposed power plant (SPT-HBC-RORC) were improved by 19.97 %, 19.95 %, and 19.96 %, respectively, compared to the conventional solar plant (SPT-HBC). However, plant total cost was increased by 11.61 %. Finally, the proposed power plant yielded power output, exergy efficiency, thermal efficiency, and levelized cost of electricity (LCOE) values of 19,918 kW, 41.36 %, 38.62 %, and 43.23 $/MWh, respectively. The fluid R1233zd(E) was recommended as the best-performing fluid thermodynamically. The suggested combination cycle outperformed the Rankine cycle and supercritical CO₂ cycle power production systems based on SPT, according to a comparison with earlier research. Additionally, the proposed combined cycle is more efficient than the SPT-based combined HBC-basic ORC system.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101127"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-05DOI: 10.1016/j.ijft.2025.101126
Hanumesh Vaidya , K.V. Prasad , Rajashekhar Choudhari , Shruthi Karanth , Neelufer Z. Basha , Kiran V
This paper gives a quantitative examination of peristaltic flow in a non-uniform tube, which includes temperature-dependent fluid characteristics and second-order slip conditions. The research uses the Rabinowitsch fluid model to describe non-Newtonian behaviour, while Buongiorno's nanofluid model characterises the fluid's thermophysical characteristics. To answer the current physical puzzle, a set of highly nonlinear equations must be translated utilising nondimensional parameters and fundamental assumptions such as a low Reynolds number and a long wavelength. The Optimal Homotopy Analysis Method (OHAM) is used to develop the solution.. We examine the impact of various physiological limitations through the generation of graphs. The graphs presented here demonstrate how various parameters affect Nusselt number, Sherwood number, temperature, velocity, concentration, skin friction, and streamlines. As a consequence of the Lorentz force, the current investigation found that the axial velocity reduces as Mn increases. The fluid's shear-thinning behaviour causes axial velocity to drop as slip parameters rise. The findings provide practical insights for enhancing heat transfer efficiency in industrial applications, particularly in systems utilizing non-Newtonian nanofluids, such as chemical processing and microfluidic devices.
{"title":"Heat and mass transfer characteristics in peristaltic Rabinowitsch nano-fluid passing through a non-uniform tube with temperature dependent variable fluid properties","authors":"Hanumesh Vaidya , K.V. Prasad , Rajashekhar Choudhari , Shruthi Karanth , Neelufer Z. Basha , Kiran V","doi":"10.1016/j.ijft.2025.101126","DOIUrl":"10.1016/j.ijft.2025.101126","url":null,"abstract":"<div><div>This paper gives a quantitative examination of peristaltic flow in a non-uniform tube, which includes temperature-dependent fluid characteristics and second-order slip conditions. The research uses the Rabinowitsch fluid model to describe non-Newtonian behaviour, while Buongiorno's nanofluid model characterises the fluid's thermophysical characteristics. To answer the current physical puzzle, a set of highly nonlinear equations must be translated utilising nondimensional parameters and fundamental assumptions such as a low Reynolds number and a long wavelength. The Optimal Homotopy Analysis Method (OHAM) is used to develop the solution.. We examine the impact of various physiological limitations through the generation of graphs. The graphs presented here demonstrate how various parameters affect Nusselt number, Sherwood number, temperature, velocity, concentration, skin friction, and streamlines. As a consequence of the Lorentz force, the current investigation found that the axial velocity reduces as <em>M<sub>n</sub></em> increases. The fluid's shear-thinning behaviour causes axial velocity to drop as slip parameters rise. The findings provide practical insights for enhancing heat transfer efficiency in industrial applications, particularly in systems utilizing non-Newtonian nanofluids, such as chemical processing and microfluidic devices.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"26 ","pages":"Article 101126"},"PeriodicalIF":0.0,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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