International Journal of Thermofluids最新文献

{"title":"A computational framework for micropolar fluid considering chemical reaction in porous media with stagnation point flow over a stretchable sheet in the presence of viscous dissipation","authors":"Muhammad Salman Kausar ,&nbsp;Ali B.M. Ali ,&nbsp;Talha Anwar ,&nbsp;Abduvali Sottarov ,&nbsp;Tadesse Walelign ,&nbsp;M. Waqas","doi":"10.1016/j.ijft.2025.101453","DOIUrl":"10.1016/j.ijft.2025.101453","url":null,"abstract":"<div><h3>Background</h3><div>The study of fluid flow over stretchable surfaces is crucial in numerous engineering and industrial applications. Particularly, the behavior of micropolar fluids which account for microstructure effects not captured by Newtonian models, presents a more accurate representation in areas like polymer processing and biological flows. The presence of porous media, stagnation point, thermal radiation and viscous dissipation further complicates the flow dynamics heat and mass transfer characteristics, making their coupled implications a significant area for research. Understanding these combined effects is vital for optimizing system performance in scenarios where chemical reactions are involved.</div></div><div><h3>Objective</h3><div>The key objective of this study is to explore the implications of a chemically reactive micropolar fluid on a stretchable sheet in the presence of porous media, a stagnation point, thermal radiation and viscous dissipation. The analysis intends to scrutinize how these aspects adjust microrotation, temperature, velocity and concentration fields within boundary-layer.</div></div><div><h3>Methodology</h3><div>The system of partial differential equations (PDEs) governing the fluid flow, heat and mass transfer is first converted into a system of ordinary differential equations (ODEs) using appropriate similarity transformations. The bvp4c procedure is then deployed to derive the numerical solutions. This method is used to accurately estimate the numerical values of the drag force, heat transmission rate and mass transmission rate for various emerging parameters. The computations are verified with previous research to confirm the outcomes.</div></div><div><h3>Findings</h3><div>The velocity field increases for higher micropolar parameter but declines with escalating suction parameter and porosity parameter. Temperature field rises with higher Eckert number while it declines for enlarged Prandtl number estimations. An increment in Schmidt number and chemical reaction factor yield lower concentration distribution. The numerical computations of drag force, mass transmission rate and heat transmission rate are estimated with greater accuracy and validated against existing literature. The efficacy of the bvp4c method in providing trustworthy solutions is exhibited.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101453"},"PeriodicalIF":0.0,"publicationDate":"2025-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145363045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced thermal analysis of thermo-bioconvection flow of water based trihybrid nanofluid with gyrotactic microbes: soret and dufour effects","authors":"Dürdanə Rustamova Farkhad ,&nbsp;Muhammad Sabaoon Khan ,&nbsp;Mirjalol Ashurov ,&nbsp;Munawar Abbas ,&nbsp;Ilyas Khan ,&nbsp;Ali Hasan Ali ,&nbsp;Nidhal Ben Khedher","doi":"10.1016/j.ijft.2025.101441","DOIUrl":"10.1016/j.ijft.2025.101441","url":null,"abstract":"<div><div>The suggested model of thermo-bioconvection flow of a water-based trihybrid nanofluid including gyrotactic microbes under Soret and Dufour effects has important applications in engineering and biomedicine. It can be used to improve mass and heat transmission in bioreactors, microfluidic devices, and wastewater treatment systems, where microbial activity is critical. Furthermore, it offers insights into enhancing thermal management in energy systems, cooling technologies, and sophisticated nanofluid-based biological processes including targeted medication delivery and microbial fuel cells. This study uses Soret and Dufour effects to describe how thermal radiation affects gyrotactic microorganisms in a water-based trihybrid nanofluid across a narrow porous surface. The impacts of magnetic fields and Hall current are all taken into consideration when analyzing fluid flow. The similarity transformation reduces a nonlinear set of PDEs to a dimensionless system of ODEs. We have used the bvp4c approach to numerically evaluate the reduced set of nonlinear ODEs. Thermal and concentration profile decline as augment the values of Marangoni convection parameter. As the values of the Marangoni convection parameter increase, the thermal and concentration profiles decrease.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101441"},"PeriodicalIF":0.0,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation-based analysis of thermal bridge reduction in multi-storey residential buildings of Bangladesh using recycled plastic waste insulation","authors":"Rid - Wanul Alam Likhon,&nbsp;Md. Abdul Hakim Khan","doi":"10.1016/j.ijft.2025.101452","DOIUrl":"10.1016/j.ijft.2025.101452","url":null,"abstract":"<div><div>In tropical climates such as Bangladesh, thermal bridging through wall-floor junctions increases indoor cooling demands and exacerbates energy shortages. Concurrently, uncontrolled plastic waste generation has become a major environmental issue. This study explores the use of post-consumer plastic waste in concrete slabs as a cost-effective and sustainable thermal insulation strategy. A 3D finite element model was developed to simulate steady-state heat transfer in a typical two-story residential building under Bangladeshi climatic conditions. Five common brick types were evaluated, with plastic content ranging from 10 % to 30 % by volume. Simulations revealed that incorporating 30 % plastic waste into Concrete Hollow Block (CHB) walls reduced heat flux by up to 29.1 %, significantly improving thermal stability. Hollow bricks and blocks demonstrated enhanced insulation properties due to air cavities, while Standard Red Bricks showed the highest heat loss. These findings indicate that integrating locally sourced plastic waste into concrete slabs can simultaneously reduce operational energy demand and divert non-biodegradable waste from landfills. The proposed method supports near-zero energy building (nZEB) objectives and provides a scalable, climate-adaptive solution for sustainable urban housing in densely populated regions like Dhaka.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101452"},"PeriodicalIF":0.0,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative experimental evaluation of wood charcoal and cocopeat fillers in a pyramid-shaped solar still for enhanced desalination performance","authors":"Arunkumar H. S ,&nbsp;Avinash K. Hegde ,&nbsp;K.Vasudeva Karanth ,&nbsp;Younes Amini ,&nbsp;Madhwesh N","doi":"10.1016/j.ijft.2025.101447","DOIUrl":"10.1016/j.ijft.2025.101447","url":null,"abstract":"<div><div>Freshwater scarcity remains a persistent challenge in arid and coastal regions, necessitating cost-effective and energy-efficient desalination solutions. This study presents an experimental performance evaluation of a pyramid-shaped solar still (PSS) enhanced with porous fillers cocopeat and wood charcoal to improve distillate productivity. The PSS, fabricated with a black-coated stainless-steel basin and insulated with thermocol and foam, was operated using both tap and saline water under coastal climatic conditions. Incorporation of fillers significantly improved the thermal regime and overall yield compared to the base model. The charcoal–saline water configuration exhibited the best performance, achieving a daily distillate yield of 950 mL and a thermal efficiency of 23.17 %, representing a 34 % enhancement over the base saline-water case (17.3 %). Cocopeat improved heat retention but resulted in slower evaporation and lower yield. The enhanced absorptivity of charcoal promoted higher basin water temperature and better energy utilization. All configurations produced very soft distillate (10–20 mg/L as CaCO₃), meeting WHO potable water standards. The findings demonstrate that low-cost filler materials, particularly wood charcoal, can significantly augment the thermal and distillation efficiency of PSS, highlighting their suitability for decentralized desalination in resource-constrained regions.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101447"},"PeriodicalIF":0.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermo-fluid analysis of a spring fin turbulator placement on the absorber plate of the solar air heater","authors":"Subash Acharya,&nbsp;K.Vasudeva Karanth,&nbsp;Shiva Kumar,&nbsp;Arunkumar H․ S․","doi":"10.1016/j.ijft.2025.101444","DOIUrl":"10.1016/j.ijft.2025.101444","url":null,"abstract":"<div><div>This study examines the thermal performance of a solar air heater integrated with spring-shaped fins beneath the absorber plate, considering variations in both longitudinal and transverse pitch. The simulations are performed in ANSYS Workbench using the RNG k-ε turbulence model with enhanced wall treatment, accounting for thermal effects and viscous heating. The assumptions considered include steady, turbulent, fully developed flow at the test section inlet, thermally developing conditions, homogeneous and isotropic walls, and no-slip boundary conditions on all fluid-contact surfaces. The fins promote turbulence within the duct, improving convective heat transfer without significantly obstructing the flow. Results show that the Nusselt number increases with a higher number of springs, achieved by reducing either longitudinal or transverse pitch. The effective thermo-hydraulic efficiency rises initially but decreases at higher flow resistance. For varying longitudinal pitch ratios, a pitch of 0.08 produces the highest Nusselt number, while a pitch of 0.16 delivers the maximum thermo-hydraulic enhancement factor (THEF) when two springs are arranged across the width, consistent across the studied flow conditions. Correlations between spring pitch ratios, Nusselt number, and friction factor are developed through regression analysis, exhibiting a maximum deviation of ±10 % from numerical results.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101444"},"PeriodicalIF":0.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrating machine learning and CFD for enhanced trailing edge serration design on a NACA 0012 wind turbine blade","authors":"Marwa Khaleel Rashid ,&nbsp;Khuder N. Abed ,&nbsp;Mohammed Alharbi ,&nbsp;Mohammed Waleed Muayad ,&nbsp;Tarik Alkharusi ,&nbsp;Arman Ameen","doi":"10.1016/j.ijft.2025.101446","DOIUrl":"10.1016/j.ijft.2025.101446","url":null,"abstract":"<div><div>This study combines machine learning (ML) techniques with computational fluid dynamics (CFD) simulations using ANSYS Fluent to investigate the impact of different trailing-edge serration designs on a NACA 0012 airfoil, a commonly used design in wind turbine blades. Building on a fundamental CFD analysis, ML-driven data augmentation—including synthetic data creation, geometric transformations, and noise sensitivity analyses—is employed to enhance and accelerate the design process. The CFD simulations utilize the k-omega SST turbulence model to calculate the lift coefficient (C_L) and drag coefficient (C_D) over a range of angles of attack (0°–20°). The ML framework evaluates the model's robustness and prediction accuracy under various noise levels and augmented training datasets. Results indicate that the rounded serration design achieves the best lift-to-drag ratio (C_L/C_D), with approximately a 15 % improvement over the baseline at an angle of attack (α) of 12° In contrast, sharp-edged serrations produce more lift at middle angles but generate increased drag at higher angles. Using hyperparameter-tuned ML models—such as Ridge regression, Random Forest, and a feedforward neural network—improves predictive accuracy and facilitates exploration of the complex design space. This combination of CFD and ML provides a robust method for optimizing wind turbine blade performance, striking a balance between aerodynamic efficiency and computational cost. Unlike previous studies that relied solely on CFD or experiments, this research integrates machine learning with CFD. This dual approach aims not only to analyze the serration geometry but also to optimize it effectively through alternative models and data augmentation. By merging fluid dynamics and machine learning, this approach transforms the design process from trial and error to a data-driven, predictive methodology, marking a significant advance in the aerodynamic design of wind turbine blades.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101446"},"PeriodicalIF":0.0,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic modelling with optimal integration of solar PV, hydro power & wind turbine hybrid system for enhanced power quality","authors":"Akhil Nigam ,&nbsp;Kamal Kant Sharma ,&nbsp;Anum Shafiq ,&nbsp;Moh Yaseen ,&nbsp;Tabassum Naz Sindhu ,&nbsp;Muhammad Ahmad Iqbal","doi":"10.1016/j.ijft.2025.101445","DOIUrl":"10.1016/j.ijft.2025.101445","url":null,"abstract":"<div><div>Due to the presence of alternate energy sources such as solar PV cell, wind, hydro etc. it is the ability of the power system to attain feasible operation and maintain the reliability of the system. These renewable energy sources provide many benefits with advanced technologies for overcoming pollution problems and maintenance costs. Since the energy demands increase then hybrid energy systems have been introduced for continuous power supply between the grid and consumer. These local non-conventional energy sources are properly used by using the concept of micro grid so this problem can be optimized even in remote area applications. Through such hybrid energy system, it provides improves reliability and power quality with better utilization efficiency. This paper emphasizes the interfacing of various energy sources to make hybrid power systems and simulation study for enhancing stability, power quality in order to optimize energy sources.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101445"},"PeriodicalIF":0.0,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on peak-valley optimization of distributed photovoltaic energy storage systems based on an improved particle swarm algorithm","authors":"Yagang An,&nbsp;Bo Feng,&nbsp;Mengyu Li,&nbsp;Xuezhe Gao,&nbsp;Hongxi Wang,&nbsp;Ji Li","doi":"10.1016/j.ijft.2025.101443","DOIUrl":"10.1016/j.ijft.2025.101443","url":null,"abstract":"<div><div>This paper proposes an improved particle swarm optimization (PSO) algorithm for optimizing the coordinated operation of energy storage systems and photovoltaic (PV) systems to address load fluctuations caused by distributed PV grid connection. First, the impact of PV grid connection on the power system is assessed, and the improved PSO algorithm is used to regulate the charging and discharging power of the energy storage system to balance supply and demand, reduce load fluctuations, and enhance peak shaving efficiency. Experimental results demonstrate that the proposed method effectively smooths the load curve, reducing the peak-to-valley difference by 23 %, improving the charging and discharging efficiency of energy storage devices by 18 %, and lowering system operating costs by 12 %. It accurately determines energy storage charging and discharging strategies and effectively controls grid load.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101443"},"PeriodicalIF":0.0,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regression analysis to predict the performance of acetone and SWCNT nano fluids in oscillating heat pipe","authors":"Parashuram A Kutakanakeri ,&nbsp;K.Rama Narasimha ,&nbsp;Roopa D ,&nbsp;Vijay Kumar S ,&nbsp;Praveen Kumar M V ,&nbsp;Vanitha K ,&nbsp;C.Durga Prasad ,&nbsp;Nagabhushana Pulla ,&nbsp;Adem Abdirkadir Aden","doi":"10.1016/j.ijft.2025.101442","DOIUrl":"10.1016/j.ijft.2025.101442","url":null,"abstract":"<div><div>This work evaluates the heat transfer capabilities of a closed-loop oscillating heat pipe (OHP) filled with acetone and SWCNT during phase change. The OHP, with four turns, was tested for its thermal performance. The study varied the acetone filler ratio from 50 % to 80 % in 10 % steps, using a copper tube with an inner diameter of 1.7 mm. Heat inputs ranging from 25 W to 40 W in 5 W steps were tested. Results show that a 70 % filler ratio of acetone and SWCNT improves thermal performance. This setup lowers the average temperature difference between the condenser and evaporator by 2.8 %, increases the heat transfer coefficient by 13.69 % and 18.6 %, and reduces thermal resistance by 4.6 % and 5.4 %, respectively. With a p-value of 0.05, a mathematical model predicting heat transfer performance was developed, indicating that the independent variables are statistically significant. The experimental value differs from the predicted value by &lt;10 %.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101442"},"PeriodicalIF":0.0,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AI-assisted CFD optimisation of multi-element wing angle of attack for enhanced formula SAE aerodynamic performance","authors":"Chakrit Suvanjumrat ,&nbsp;Sirawit Namchanthra ,&nbsp;Tinnapob Phengpom ,&nbsp;Jetsadaporn Priyadumkol ,&nbsp;Watcharapong Chookaew ,&nbsp;Sarawoot Watechagit ,&nbsp;Sherman C.P. Cheung ,&nbsp;Machimontorn Promtong","doi":"10.1016/j.ijft.2025.101440","DOIUrl":"10.1016/j.ijft.2025.101440","url":null,"abstract":"<div><div>This study presents a multi-level aerodynamic optimisation framework that integrates Computational Fluid Dynamics (CFD) with Artificial Intelligence (AI) techniques to enhance the performance of Formula SAE vehicles. Unlike conventional CFD or empirical approaches, the proposed framework employs a hybrid Genetic Algorithm–Artificial Neural Network (GA–ANN) model to optimise design parameters with greater accuracy and efficiency. Initial investigations refined the angles of attack (AoA) and airfoil geometries to maximise downforce while reducing drag and energy consumption. Two-dimensional CFD simulations established the baseline aerodynamic characteristics, which were subsequently extended to full three-dimensional analyses. Among turbulence models, the Menter k–ω SST demonstrated superior predictive capability compared to the standard k–ε, with discrepancies in drag and downforce below 15 %. The MSHD and Selig 1223 airfoils emerged as the most aerodynamically efficient candidates. Systematic AoA adjustments from 4.5°, 28.0°, and 56.0° to 5.5°, 33.0°, and 59.5° for the front wing, and from 9.5° and 40.0° to 12.2° and 41.9° for the rear wing produced CFD predictions validated within a 5 % error margin. The GA–ANN optimisation further enhanced aerodynamic performance, yielding a 14.8 % increase in front-wing downforce and a 28.4 % increase in rear-wing downforce, alongside reduced drag and improved energy efficiency. These findings demonstrate the potential of AI-assisted CFD optimisation to bridge high-fidelity simulations with tangible performance gains, offering a promising pathway for hybrid airfoil design and active control strategies in high-performance automotive applications.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"30 ","pages":"Article 101440"},"PeriodicalIF":0.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}