The present work reports natural convection and entropy generation inside the cavity (with a plane or undulated wall) filled with CuO-Water or Al2O3-Water nanofluid. The results are produced considering the effect of Rayleigh number, Darcy number, Hartmann number and volume fraction of nanofluid (Φ). Heat transfer improves with the mixing of nanoparticles only for the case of Da of 0.01 for all Ra. Various thermal boundary conditions such as uniform, sinusoidally and linearly varying temperature have been imposed at the wavy hot wall. It is found that the average surface Nu for the cavity with uniform temperature is more compared to sinusoidally or linearly varying temperature. Nu for a cavity filled with Al2O3-Water nanofluid is slightly lower than the CuOWater nanofluid for all cases. Local Nu for the plane and undulated wall has been plotted, which shows that it is maximum at the crest of the undulated wall. In addition to the heat transfer, entropy generation is determined against all the relevant parameters, which adds more value to the present work.
{"title":"Effect of Cavity Undulations and Thermal Boundary Conditions on Natural Convection and Entropy Generation in CuO-Water/Al2O3-Water Nanofluid","authors":"S. Acharya","doi":"10.1166/jon.2023.1956","DOIUrl":"https://doi.org/10.1166/jon.2023.1956","url":null,"abstract":"The present work reports natural convection and entropy generation inside the cavity (with a plane or undulated wall) filled with CuO-Water or Al2O3-Water nanofluid. The results are produced considering the effect of Rayleigh number, Darcy number, Hartmann number\u0000 and volume fraction of nanofluid (Φ). Heat transfer improves with the mixing of nanoparticles only for the case of Da of 0.01 for all Ra. Various thermal boundary conditions such as uniform, sinusoidally and linearly varying temperature have been imposed at the wavy hot wall. It\u0000 is found that the average surface Nu for the cavity with uniform temperature is more compared to sinusoidally or linearly varying temperature. Nu for a cavity filled with Al2O3-Water nanofluid is slightly lower than the CuOWater nanofluid for all cases. Local Nu for the\u0000 plane and undulated wall has been plotted, which shows that it is maximum at the crest of the undulated wall. In addition to the heat transfer, entropy generation is determined against all the relevant parameters, which adds more value to the present work.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44542754","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}
A. Negi, B. Kumar, Ashok Kumar, Prachi, A. Singhal, A. Ray, A. Chamkha
We have developed a mathematical model and obtained a numerical solution for the motion of a non-Newtonian Maxwell fluid between two disks having rotation and stretching velocity with convective boundary constraints, porous medium and thermal radiation. The present Maxwell fluid flow model with specified boundary constraints is not discussed so far. The proposed model has a lot of applications in electrical power generation, nuclear energy plants, astrophysical flows, space vehicles, geothermal extractions, and spinning disc reactor. The Von Karman similarity approach is used for the solution and validation of the solution is also provided. The solution is obtained numerically with finite difference method (FDM) based ND-solve command in Mathematica software. The effects of magnetic field, porous medium, radiation parameter, Deborah number, Prandtl number, and Reynolds number on skin friction, heat transfer, flow and temperature fields are discussed in detail. Due to the significant void fraction in the medium, porosity parameter shows unique trend compared to other parameters for the radial velocity profile. It has tendency to enhance the radial velocity near both the disc but in the middle part of system, porosity parameter retards radial velocity significantly.
{"title":"The Transportation of Maxwell Fluid in the Rotating and Stretching System: Rotor-Stator Spinning Disc Reactor Applications","authors":"A. Negi, B. Kumar, Ashok Kumar, Prachi, A. Singhal, A. Ray, A. Chamkha","doi":"10.1166/jon.2023.2007","DOIUrl":"https://doi.org/10.1166/jon.2023.2007","url":null,"abstract":"We have developed a mathematical model and obtained a numerical solution for the motion of a non-Newtonian Maxwell fluid between two disks having rotation and stretching velocity with convective boundary constraints, porous medium and thermal radiation. The present Maxwell fluid flow\u0000 model with specified boundary constraints is not discussed so far. The proposed model has a lot of applications in electrical power generation, nuclear energy plants, astrophysical flows, space vehicles, geothermal extractions, and spinning disc reactor. The Von Karman similarity approach\u0000 is used for the solution and validation of the solution is also provided. The solution is obtained numerically with finite difference method (FDM) based ND-solve command in Mathematica software. The effects of magnetic field, porous medium, radiation parameter, Deborah number, Prandtl number,\u0000 and Reynolds number on skin friction, heat transfer, flow and temperature fields are discussed in detail. Due to the significant void fraction in the medium, porosity parameter shows unique trend compared to other parameters for the radial velocity profile. It has tendency to enhance the radial\u0000 velocity near both the disc but in the middle part of system, porosity parameter retards radial velocity significantly.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47397405","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}
This paper presents an investigation for steady Casson nanofluid flow behavior between parallel plates in the presence of uniform magnetic field. The governing equations are solved via Semi-analytical method, The Akbari Ganji’s Method (AGM). The validity of this method was verified by comparison with results given by using Runge-Kutta. The analysis is carried out for different parameters namely: Viscosity parameter, Magnetic parameter, casson parameter. Results reveal that skin friction coefficient enhances with rise of viscosity, Magnetic parameters and volume fraction. The results of this study can help engineers improve, and researchers can conduct research faster and easier on this type of problem. Also This work helps researchers to master the theoretical calculation of this type of problem.
{"title":"Steady Magnetohydrodynamic Casson Nanofluid Flow Between Two Infinit Parallel Plates Using Akbari Ganji’s Method (AGM)","authors":"A. El Harfouf, S. Hayani Mounir, Abderrahim Wakif","doi":"10.1166/jon.2023.1947","DOIUrl":"https://doi.org/10.1166/jon.2023.1947","url":null,"abstract":"This paper presents an investigation for steady Casson nanofluid flow behavior between parallel plates in the presence of uniform magnetic field. The governing equations are solved via Semi-analytical method, The Akbari Ganji’s Method (AGM). The validity of this method was verified\u0000 by comparison with results given by using Runge-Kutta. The analysis is carried out for different parameters namely: Viscosity parameter, Magnetic parameter, casson parameter. Results reveal that skin friction coefficient enhances with rise of viscosity, Magnetic parameters and volume fraction.\u0000 The results of this study can help engineers improve, and researchers can conduct research faster and easier on this type of problem. Also This work helps researchers to master the theoretical calculation of this type of problem.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44221891","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}
A numerical study is conducted to observe the thermal and flow performance of TiO2 nanofluid in the circular and square ducts with different twisted tape arrangements. The presence of the twisted tape in the tube induces swirl flow, which aids in the heat transfer, but at the penalty of a higher friction factor. The results also reveal that the maximum Nusselt number enhancement is obtained in the circular tube when the counter-triple twisted tape arrangement (C-TTs) is adopted while it is co-triple twisted tape arrangement (Co-TTs) for the case of square duct. Besides, the highest friction factor is observed for the Co-TTs for both circular and square ducts. The heat transfer and friction factor in the circular duct are greater than that of the square duct. The highest thermal performance factor of 1.286 is obtained when the single twisted tape and 1.5% nanofluid are used in the circular tube. However, multiple twisted tape inserts in the square duct contributes to improved thermal performance at a relatively lower friction factor when compared to the circular tube. Therefore, it is recommended to implement the square duct with multiple inserts for compact or microchannel heat exchanger for heat transfer application.
{"title":"Thermal and Flow Analysis of TiO2 Nanofluid Flow in Circular and Square Ducts with Multiple Twisted Tape Inserts","authors":"Amelia Shi Hann Wong, A. N. T. Tiong","doi":"10.1166/jon.2023.1913","DOIUrl":"https://doi.org/10.1166/jon.2023.1913","url":null,"abstract":"A numerical study is conducted to observe the thermal and flow performance of TiO2 nanofluid in the circular and square ducts with different twisted tape arrangements. The presence of the twisted tape in the tube induces swirl flow, which aids in the heat transfer, but at\u0000 the penalty of a higher friction factor. The results also reveal that the maximum Nusselt number enhancement is obtained in the circular tube when the counter-triple twisted tape arrangement (C-TTs) is adopted while it is co-triple twisted tape arrangement (Co-TTs) for the case of square duct.\u0000 Besides, the highest friction factor is observed for the Co-TTs for both circular and square ducts. The heat transfer and friction factor in the circular duct are greater than that of the square duct. The highest thermal performance factor of 1.286 is obtained when the single twisted tape\u0000 and 1.5% nanofluid are used in the circular tube. However, multiple twisted tape inserts in the square duct contributes to improved thermal performance at a relatively lower friction factor when compared to the circular tube. Therefore, it is recommended to implement the square duct with multiple\u0000 inserts for compact or microchannel heat exchanger for heat transfer application.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42388463","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}
Taghreed H. Alarabi, N. S. Elgazery, Asmaa F. Elelamy
In this paper, we have researched the conduct of non-Newtonian micropolar nanofluid flow through horizontal circular under the impacts of nanoparticles, oxytatic bacterial and Hall current effects. The utilizations of the current investigation are exceptionally powerful in biomedical therapies, for example, obliteration of malignant growth over biological cells by utilizing drug conveyance of nanoparticles and oxytatic microscopic organisms. If there should arise an occurrence of biological nanofluid it’s accepted to concern variable physical parameters which rely on the nanofluid temperature. Implicit Chebyshev pseudospectral (ICPS) technique by helping MATHEMATICA software has been applied to governing nonlinear system of dimensionless partial differential equations (PDEs). The nanofluid velocity, microrotation angular velocity, temperature, motile bacterial density distributions, oxygen concentration, local skin friction coefficient, Nusselt number, and wall motile density gradient distributions are delineated graphically for various variable physical parameters, likewise comparison between certain results in literature and our current output is introduced and great arrangement is found.
{"title":"How do the Intravenously Injection of Nanoparticle and Oxytatic Bacteria Affect Through Circular Cylinder Cell for Non-Newtonian Micropolar Fluid: Mathematical Approach","authors":"Taghreed H. Alarabi, N. S. Elgazery, Asmaa F. Elelamy","doi":"10.1166/jon.2023.1941","DOIUrl":"https://doi.org/10.1166/jon.2023.1941","url":null,"abstract":"In this paper, we have researched the conduct of non-Newtonian micropolar nanofluid flow through horizontal circular under the impacts of nanoparticles, oxytatic bacterial and Hall current effects. The utilizations of the current investigation are exceptionally powerful in biomedical\u0000 therapies, for example, obliteration of malignant growth over biological cells by utilizing drug conveyance of nanoparticles and oxytatic microscopic organisms. If there should arise an occurrence of biological nanofluid it’s accepted to concern variable physical parameters which rely\u0000 on the nanofluid temperature. Implicit Chebyshev pseudospectral (ICPS) technique by helping MATHEMATICA software has been applied to governing nonlinear system of dimensionless partial differential equations (PDEs). The nanofluid velocity, microrotation angular velocity, temperature,\u0000 motile bacterial density distributions, oxygen concentration, local skin friction coefficient, Nusselt number, and wall motile density gradient distributions are delineated graphically for various variable physical parameters, likewise comparison between certain results in literature and our\u0000 current output is introduced and great arrangement is found.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43730763","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}
The impact of magnetic field, joule heating, rotation parameter, Hall current, with nonlinear thermal radiation, on a rotating hybrid Fe3O4/Al2O3 nanofluid over-stretched plate is the focus of this research. Using similarity transformations, the controlling partial differential equations are turned into a set of nonlinear ordinary differential equations. For that system of equations, the shooting method is used to generate numerical solutions. The impact of various entry parameters on transversal and longitudinal velocities, temperature, heat flow and surface shear stress are studied numerically and graphically. The results obtained confirm that When hybrid nanoparticles are present, skin friction on the surface increases by (31.91%–51.27%) and the Nusselt number falls by (4.4%–7.57%) for 5% Al2O3 plus (5%–10%) magnetite.
{"title":"Impact of Hall Current and Joule Heating on a Rotating Hybrid Nanofluid Over a Stretched Plate with Nonlinear Thermal Radiation","authors":"E. Elsaid, Khalid S. AlShurafat","doi":"10.1166/jon.2023.1927","DOIUrl":"https://doi.org/10.1166/jon.2023.1927","url":null,"abstract":"The impact of magnetic field, joule heating, rotation parameter, Hall current, with nonlinear thermal radiation, on a rotating hybrid Fe3O4/Al2O3 nanofluid over-stretched plate is the focus of this research. Using similarity transformations,\u0000 the controlling partial differential equations are turned into a set of nonlinear ordinary differential equations. For that system of equations, the shooting method is used to generate numerical solutions. The impact of various entry parameters on transversal and longitudinal velocities, temperature,\u0000 heat flow and surface shear stress are studied numerically and graphically. The results obtained confirm that When hybrid nanoparticles are present, skin friction on the surface increases by (31.91%–51.27%) and the Nusselt number falls by (4.4%–7.57%) for 5% Al2O3\u0000 plus (5%–10%) magnetite.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48036314","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}
Richa Saha, M. Narayana, P. Siddheshwar, S. S. Nagouda
This paper presents a comparative study between the thermo-convective flows of two mono- and one hybrid-nanofluid over three uniformly heated undulated surfaces (described by sinusoidal, sawtooth or triangular waveforms) embedded in a porous medium. The base fluid for each nanofluid is water, and the nanoparticles are copper, alumina or a copper-alumina mixture. Two different types of materials of the porous medium have been considered: aluminum foam and glass balls. This problem is governed by a system of nonlinear, coupled partial differential equations, which is solved using the Keller-Box method. The influences of each porous medium and the pertinent parameters on the nanofluid flows and heat transfer have been explored. It is seen that secondary flow occurs at large amplitudes of the surface undulations for the sinusoidal and triangular waveforms, but no such flow is observed in the case of the sawtooth waveform and the flat surface. To assess the heat transfer properties, the mean Nusselt number has been calculated. It is observed that the mean Nusselt number is higher in the porous medium of glass balls than aluminum foam. The heat transfer on the undulated surfaces is the highest in the case of a hybrid-nanofluid and the least for water-alumina.
{"title":"Thermo-Convective Flows of Mono- and Hybrid-Nanofluids Over Horizontal Undulated Surfaces in a Porous Medium","authors":"Richa Saha, M. Narayana, P. Siddheshwar, S. S. Nagouda","doi":"10.1166/jon.2023.1920","DOIUrl":"https://doi.org/10.1166/jon.2023.1920","url":null,"abstract":"This paper presents a comparative study between the thermo-convective flows of two mono- and one hybrid-nanofluid over three uniformly heated undulated surfaces (described by sinusoidal, sawtooth or triangular waveforms) embedded in a porous medium. The base fluid for each nanofluid\u0000 is water, and the nanoparticles are copper, alumina or a copper-alumina mixture. Two different types of materials of the porous medium have been considered: aluminum foam and glass balls. This problem is governed by a system of nonlinear, coupled partial differential equations, which is solved\u0000 using the Keller-Box method. The influences of each porous medium and the pertinent parameters on the nanofluid flows and heat transfer have been explored. It is seen that secondary flow occurs at large amplitudes of the surface undulations for the sinusoidal and triangular waveforms, but\u0000 no such flow is observed in the case of the sawtooth waveform and the flat surface. To assess the heat transfer properties, the mean Nusselt number has been calculated. It is observed that the mean Nusselt number is higher in the porous medium of glass balls than aluminum foam. The heat transfer\u0000 on the undulated surfaces is the highest in the case of a hybrid-nanofluid and the least for water-alumina.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48156552","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}
An Experiment has been performed to find out effect of coiled spring turbulators on the heat transfer and pressure drop in a triple tube heat exchanger using water and CuO/water (0.8%vol/vol) as working media. Two spring turbulators having pitch 5 mm and 10 mm with a common wire diameter of 1 mm are being used. The experiment was carried out under turbulent flow at different Reynolds numbers varying between 4000 to 16,000. In this experiment, the variation in the rate of heat transfer and friction factor have been analyzed for parallel and counter flow arrangements. The combination of the lower-pitched insert with CuO attained the maximum heat transfer increment in the counter flow pattern. For counter flow arrangement, augmentation in Nusselt number for a triple tube with lower spring pitch with CuO nanofluid is 63.33%, which is higher in comparison to the plain triple tube with water as working fluid. The maximum thermal performance value is observed for plain tube with CuO nanofluid having the value 1.04 at Reynolds number of 4000.
{"title":"Experimental Analysis of Heat Transfer in a Triple Tube Heat Exchanger with Spring Turbulator Using CuO/Water Nanofluid","authors":"R. Kumar, P. Chandra, Harsimranjot Singh","doi":"10.1166/jon.2023.1936","DOIUrl":"https://doi.org/10.1166/jon.2023.1936","url":null,"abstract":"An Experiment has been performed to find out effect of coiled spring turbulators on the heat transfer and pressure drop in a triple tube heat exchanger using water and CuO/water (0.8%vol/vol) as working media. Two spring turbulators having pitch 5 mm and 10 mm with a common wire diameter\u0000 of 1 mm are being used. The experiment was carried out under turbulent flow at different Reynolds numbers varying between 4000 to 16,000. In this experiment, the variation in the rate of heat transfer and friction factor have been analyzed for parallel and counter flow arrangements. The combination\u0000 of the lower-pitched insert with CuO attained the maximum heat transfer increment in the counter flow pattern. For counter flow arrangement, augmentation in Nusselt number for a triple tube with lower spring pitch with CuO nanofluid is 63.33%, which is higher in comparison to the plain triple\u0000 tube with water as working fluid. The maximum thermal performance value is observed for plain tube with CuO nanofluid having the value 1.04 at Reynolds number of 4000.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47680325","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}
Effects of electrical conductivity of cylindrical walls on both heat transfer enhancement in nanofluid swirling flow and fluid layers produced in a cylindrical container are numerically analyzed. A temperature gradient and external magnetic field are imposed in the axial direction on the rotating flow which is moved by the bottom disk. The governing equations that describe the combined problem (MHD and mixed convection) under the adoptive assumptions are solved numerically by the finite volume technique. Calculations were made for fixed Reynolds number (Re = 1000), Richardson number (0 ≤ Ri ≤ 2), aspect ratio (H/R = 2), Hartmann number (0 ≤ Ha ≤ 60), and solid nanoparticle (copper) with volume fraction (Φ = 0.1). A decrease in the mean Nusselt number was found with the increase of the Richardson number due to stratification layers. These latter limits the heat transfers between the hot and cold zones of the cylinder. The results indicate that the Nusselt number gets bigger within a certain range of Hartmann numbers, and especially when the rotating lid is electrically conducting. Indeed, average Nusselt number decreases while the Hartmann number increase after it exceeds a critical value. Finally, the electrical conductivity of the rotating lid plays an important role in heat transfer enhancement in nanofluid swirling flow.
{"title":"Effect of Wall Electrical Conductivity on Heat Transfer Enhancement of Swirling Nanofluid-Flow","authors":"B. Mahfoud","doi":"10.1166/jon.2023.1932","DOIUrl":"https://doi.org/10.1166/jon.2023.1932","url":null,"abstract":"Effects of electrical conductivity of cylindrical walls on both heat transfer enhancement in nanofluid swirling flow and fluid layers produced in a cylindrical container are numerically analyzed. A temperature gradient and external magnetic field are imposed in the axial direction on\u0000 the rotating flow which is moved by the bottom disk. The governing equations that describe the combined problem (MHD and mixed convection) under the adoptive assumptions are solved numerically by the finite volume technique. Calculations were made for fixed Reynolds number (Re = 1000),\u0000 Richardson number (0 ≤ Ri ≤ 2), aspect ratio (H/R = 2), Hartmann number (0 ≤ Ha ≤ 60), and solid nanoparticle (copper) with volume fraction (Φ = 0.1). A decrease in the mean Nusselt number was found with the increase of the Richardson number due\u0000 to stratification layers. These latter limits the heat transfers between the hot and cold zones of the cylinder. The results indicate that the Nusselt number gets bigger within a certain range of Hartmann numbers, and especially when the rotating lid is electrically conducting. Indeed, average\u0000 Nusselt number decreases while the Hartmann number increase after it exceeds a critical value. Finally, the electrical conductivity of the rotating lid plays an important role in heat transfer enhancement in nanofluid swirling flow.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48440691","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}
R. Panda, L. Panigrahi, M. K. Nayak, A. Chamkha, S. Sahoo, A. Barik
Nanofluid applications in solar collectors are an emerging area for enhanced heat transfer resulting in heat gain for domestic and industrial use. In the present work, the performance of a Flat Plate Solar Collector (FPSC) having water-CuO-based nanofluid has been studied. The effect of the tilting angle of cylindrical pipe and porosity of porous material is investigated for this nanofluid-based FPSC. A numerical approach has been adopted to stimulate the governing equations in the tube. The similarity transformation simplifies the model (PDEs) into ordinary differential equations (ODEs). The governing non-dimensional PDEs along with their appropriate boundary conditions are solved numerically using the 4th order Runge-Kutta method cum shooting technique. The impacts of significant and relevant physical parameters and physical quantities of interest are analyzed. From the present study, it is observed that amplification of tilting angle and curvature parameter ameliorates the heat transfer rate while that of porosity parameter controls it effectively. A similar approach can be employed for other solar collectors to assess the heat transfer augmentation by using nanofluids instead of existing fluids.
{"title":"Nanofluid Based Pipe Flow Analysis in Absorber Pipe of Flat Plate Solar Collector: Effects of Inclination and Porosity","authors":"R. Panda, L. Panigrahi, M. K. Nayak, A. Chamkha, S. Sahoo, A. Barik","doi":"10.1166/jon.2023.1979","DOIUrl":"https://doi.org/10.1166/jon.2023.1979","url":null,"abstract":"Nanofluid applications in solar collectors are an emerging area for enhanced heat transfer resulting in heat gain for domestic and industrial use. In the present work, the performance of a Flat Plate Solar Collector (FPSC) having water-CuO-based nanofluid has been studied. The effect\u0000 of the tilting angle of cylindrical pipe and porosity of porous material is investigated for this nanofluid-based FPSC. A numerical approach has been adopted to stimulate the governing equations in the tube. The similarity transformation simplifies the model (PDEs) into ordinary differential\u0000 equations (ODEs). The governing non-dimensional PDEs along with their appropriate boundary conditions are solved numerically using the 4th order Runge-Kutta method cum shooting technique. The impacts of significant and relevant physical parameters and physical quantities of interest are analyzed.\u0000 From the present study, it is observed that amplification of tilting angle and curvature parameter ameliorates the heat transfer rate while that of porosity parameter controls it effectively. A similar approach can be employed for other solar collectors to assess the heat transfer augmentation\u0000 by using nanofluids instead of existing fluids.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44477100","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}
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