Pub Date : 2023-10-01DOI: 10.36963/ijtst.2023100405
G. Y. H., N. H
{"title":"Effect of viscous dissipation on the onset of jeffery fluid porous convection in the presence of throughflow and electric field","authors":"G. Y. H., N. H","doi":"10.36963/ijtst.2023100405","DOIUrl":"https://doi.org/10.36963/ijtst.2023100405","url":null,"abstract":"","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325998","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}
Pub Date : 2023-10-01DOI: 10.36963/ijtst.2023100402
Benhizia Oussama, B. Mohamed
{"title":"Natural convection of power-law fluid in a horizontal annulus between outer cylinder and inner flat tube","authors":"Benhizia Oussama, B. Mohamed","doi":"10.36963/ijtst.2023100402","DOIUrl":"https://doi.org/10.36963/ijtst.2023100402","url":null,"abstract":"","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139330231","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}
Pub Date : 2023-10-01DOI: 10.36963/ijtst.2023100401
MD Tanvir Khan, Sudipta Debnath, Z. U. Ahmed
{"title":"Thermo-fluidic characteristics of an aerodynamic swirl nozzle with low-concentration nanofluids","authors":"MD Tanvir Khan, Sudipta Debnath, Z. U. Ahmed","doi":"10.36963/ijtst.2023100401","DOIUrl":"https://doi.org/10.36963/ijtst.2023100401","url":null,"abstract":"","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139327964","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}
Pub Date : 2023-10-01DOI: 10.36963/ijtst.2023100404
Mohammed Mehemmai, H. Grine, Hakim Madani, C. Bougriou
{"title":"Performance analysis of ejector refrigeration cycle with zeotropic mixtures","authors":"Mohammed Mehemmai, H. Grine, Hakim Madani, C. Bougriou","doi":"10.36963/ijtst.2023100404","DOIUrl":"https://doi.org/10.36963/ijtst.2023100404","url":null,"abstract":"","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139324945","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}
Pub Date : 2023-10-01DOI: 10.36963/ijtst.2023100403
Sid Ali Si Salah, Abdelwahid Azzi, E. Filali
{"title":"Evaluation of conventional fluid mechanic theory in small channels with singularity","authors":"Sid Ali Si Salah, Abdelwahid Azzi, E. Filali","doi":"10.36963/ijtst.2023100403","DOIUrl":"https://doi.org/10.36963/ijtst.2023100403","url":null,"abstract":"","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139330191","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}
Pub Date : 2023-08-01DOI: 10.36963/ijtst.2023100303
Suwimon Saneewong Na Ayuttaya
Within the vertical 2-Dimensional (2D) asymmetrical model, the blood flow transport through a narrow semicircle shape is the numerical study based on the concept of the electrokinetic flow technique. In this study, the blood flow transport has been compared to the electric field, the flow pattern, the pressure field, the vorticity, the temperature field, and the concentration field with and without the electrokinetic flow. The electrical voltage and time are varied from 0 – 20 kV and 0 – 1 s, respectively. The result has shown that the blood flow transport is moved upward within the vertical 2D asymmetrical model and the electric field has not appeared in the case of without the electrokinetic flow. With the electrokinetic flow, the flow pattern, the pressure field, the vorticity field, the temperature field, and the concentration field are not the same pattern as the electric field but they are induced by the electric field. Furthermore, at the center of a narrow semicircle shape, the electric value, the velocity, and the pressure are increased with the electrical voltage increasing but the vorticity and concentration are decreased with the electrical voltage increasing. Finally, the experimental result is compared with the numerical result, it can be seen that simulation results had good agreement with experiment results.
{"title":"Blood flow transport with electrokinetic flow technique through a narrow semicircle shape within the vertical 2D asymmetrical model","authors":"Suwimon Saneewong Na Ayuttaya","doi":"10.36963/ijtst.2023100303","DOIUrl":"https://doi.org/10.36963/ijtst.2023100303","url":null,"abstract":"Within the vertical 2-Dimensional (2D) asymmetrical model, the blood flow transport through a narrow semicircle shape is the numerical study based on the concept of the electrokinetic flow technique. In this study, the blood flow transport has been compared to the electric field, the flow pattern, the pressure field, the vorticity, the temperature field, and the concentration field with and without the electrokinetic flow. The electrical voltage and time are varied from 0 – 20 kV and 0 – 1 s, respectively. The result has shown that the blood flow transport is moved upward within the vertical 2D asymmetrical model and the electric field has not appeared in the case of without the electrokinetic flow. With the electrokinetic flow, the flow pattern, the pressure field, the vorticity field, the temperature field, and the concentration field are not the same pattern as the electric field but they are induced by the electric field. Furthermore, at the center of a narrow semicircle shape, the electric value, the velocity, and the pressure are increased with the electrical voltage increasing but the vorticity and concentration are decreased with the electrical voltage increasing. Finally, the experimental result is compared with the numerical result, it can be seen that simulation results had good agreement with experiment results.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41978779","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}
Pub Date : 2023-07-01DOI: 10.36963/ijtst.2023100301
S. Ramprasad, Nagabhushana Pulla, Y. S. Kalyan Chakravarthy
This paper gives the numerical analysis for an electro-osmotic Eyring-Powell fluid flow that is in two dimensions along a stretched sheet. The modified governing equations are resolved by the finite element technique. Graphs are used to display the various properties for several relevant factors on dimensionless velocity and temperature fields. The results are compared with previous findings in order to confirm the accuracy of the numerical solution. There appears to be a decrease in velocity when the magnetic parameter and Eckret number increase. This study has implications for fluidization, environmental pollutants, and agriculture. In this study, computational fluid dynamics (CFD) simulations and an artificial neural network (ANN) model are both employed.
{"title":"Finite element analysis for electro-osmotic Erying-Powell fluid flow past a stretching sheet with an exponential heat source - an ANN approach","authors":"S. Ramprasad, Nagabhushana Pulla, Y. S. Kalyan Chakravarthy","doi":"10.36963/ijtst.2023100301","DOIUrl":"https://doi.org/10.36963/ijtst.2023100301","url":null,"abstract":"This paper gives the numerical analysis for an electro-osmotic Eyring-Powell fluid flow that is in two dimensions along a stretched sheet. The modified governing equations are resolved by the finite element technique. Graphs are used to display the various properties for several relevant factors on dimensionless velocity and temperature fields. The results are compared with previous findings in order to confirm the accuracy of the numerical solution. There appears to be a decrease in velocity when the magnetic parameter and Eckret number increase. This study has implications for fluidization, environmental pollutants, and agriculture. In this study, computational fluid dynamics (CFD) simulations and an artificial neural network (ANN) model are both employed.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46442430","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}
Convective heat transfer is a physical phenomenon that continues to attract the interest of researchers in many fields of science and engineering. This work aims at numerically investigating the enhancement of heat transfer in a differentially heated three-dimensional cavity using a hybrid Al2O3-Cu-water nanofluid and Al2O3-water nanofluid. The partial differential equations are discretized in 3D by adopting the finite volume method and using the SIMPLEC algorithm for pressure correction. Heat transfer and fluid flow results are presented in the form of isotherms, velocity fields and mean Nusselt number. The results show that the effect of nanofluid and hybrid nanofluid on natural convection is more significant when the Rayleigh number is high. The use of hybrid nanofluid improves the heat transfer compared to nanofluid.
对流换热是一种物理现象，在许多科学和工程领域一直引起研究人员的兴趣。本研究旨在数值研究al2o3 - cu -水纳米流体和al2o3 -水纳米流体在差分加热三维腔体中的传热增强。采用有限体积法对偏微分方程进行三维离散，并采用SIMPLEC算法进行压力校正。传热和流体流动结果以等温线、速度场和平均努塞尔数的形式给出。结果表明:当瑞利数较大时，纳米流体和混合纳米流体对自然对流的影响更为显著;与纳米流体相比，混合纳米流体的使用改善了传热。
{"title":"Free convection of hybrid water/aluminum oxide-copper nanofluid in cubic cavity","authors":"Dayf Abdellatif, Feddaoui M’barek, Bouchta Said, Hissouf Mohamed, El Ihssini Hossine","doi":"10.36963/ijtst.2023100203","DOIUrl":"https://doi.org/10.36963/ijtst.2023100203","url":null,"abstract":"Convective heat transfer is a physical phenomenon that continues to attract the interest of researchers in many fields of science and engineering. This work aims at numerically investigating the enhancement of heat transfer in a differentially heated three-dimensional cavity using a hybrid Al2O3-Cu-water nanofluid and Al2O3-water nanofluid. The partial differential equations are discretized in 3D by adopting the finite volume method and using the SIMPLEC algorithm for pressure correction. Heat transfer and fluid flow results are presented in the form of isotherms, velocity fields and mean Nusselt number. The results show that the effect of nanofluid and hybrid nanofluid on natural convection is more significant when the Rayleigh number is high. The use of hybrid nanofluid improves the heat transfer compared to nanofluid.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44759752","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}
Pub Date : 2023-07-01DOI: 10.36963/ijtst.2023100302
G. Y. H., N. H.
The linear stability analysis is carried out for the onset of double-diffusive convection in a fluid layer with a boundary slab along with temperature-dependent viscosity and gravity fluctuation. The authors proposed three types of gravity fluctuation. We considered three cases of gravity field fluctuation: (a) linear and (b)parabolic and (c) cubic. An analytical solution for the subsequent problem is acquired through the perturbation technique. The findings demonstrate that the viscosity variation parameter, the thermal conductivity ratio, the gravity parameter, the depth ratio, and the soret parameter accelerate the start of convection, while the increasing Lewis number slow down the convective motion. Additionally, the system was found to be more stable for the linear type of gravity field fluctuation and more unstable for the cubic type of gravity field fluctuation.
{"title":"Influence of variable viscosity and gravity fluctuation on double diffusive convection in a fluid layer with boundary slab of finite conductivity","authors":"G. Y. H., N. H.","doi":"10.36963/ijtst.2023100302","DOIUrl":"https://doi.org/10.36963/ijtst.2023100302","url":null,"abstract":"The linear stability analysis is carried out for the onset of double-diffusive convection in a fluid layer with a boundary slab along with temperature-dependent viscosity and gravity fluctuation. The authors proposed three types of gravity fluctuation. We considered three cases of gravity field fluctuation: (a) linear and (b)parabolic and (c) cubic. An analytical solution for the subsequent problem is acquired through the perturbation technique. The findings demonstrate that the viscosity variation parameter, the thermal conductivity ratio, the gravity parameter, the depth ratio, and the soret parameter accelerate the start of convection, while the increasing Lewis number slow down the convective motion. Additionally, the system was found to be more stable for the linear type of gravity field fluctuation and more unstable for the cubic type of gravity field fluctuation.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44268360","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}
Pub Date : 2023-07-01DOI: 10.36963/ijtst.2023100204
Hassen Haithem, S. Touahri, T. Boufendi
In this work, we numerically study the three-dimensional conjugate mixed convection heat transfer in a horizontal annulus equipped by longitudinal and transversal fins attached on its internal surface of outer cylinder. The external pipe and fins are heated by an electrical current passing through their small thickness while the inner pipe is kept adiabatic. We investigate the effects of adding longitudinal and transversal fins on the fluid dynamic and the heat transfer performances. The number of longitudinal fins varies from two to eight fins while the number of transvers ones is equal to four. The convection in the fluid domain is conjugated to thermal conduction in the pipes and fins solid thickness. The physical properties of the fluid are thermal dependent and the heat losses from the external pipe surface to the surrounding environment are taken account. The model equations of continuity, momenta and energy are numerically solved by the finite volume method with a second order spatiotemporal discretization. The Prandtl, the Reynolds and the Grashof numbers are fixed at 8.082, 399.02 and 12801 respectively. The obtained results showed that the axial Nusselt number increases with the increasing of number of fins. Moreover, the longitudinal fins configuration showed a more significant improvement in heat transfer than that of the transverse fins.
{"title":"Conjugate heat transfer in an annulus with heated longitudinal and transversal fins","authors":"Hassen Haithem, S. Touahri, T. Boufendi","doi":"10.36963/ijtst.2023100204","DOIUrl":"https://doi.org/10.36963/ijtst.2023100204","url":null,"abstract":"In this work, we numerically study the three-dimensional conjugate mixed convection heat transfer in a horizontal annulus equipped by longitudinal and transversal fins attached on its internal surface of outer cylinder. The external pipe and fins are heated by an electrical current passing through their small thickness while the inner pipe is kept adiabatic. We investigate the effects of adding longitudinal and transversal fins on the fluid dynamic and the heat transfer performances. The number of longitudinal fins varies from two to eight fins while the number of transvers ones is equal to four. The convection in the fluid domain is conjugated to thermal conduction in the pipes and fins solid thickness. The physical properties of the fluid are thermal dependent and the heat losses from the external pipe surface to the surrounding environment are taken account. The model equations of continuity, momenta and energy are numerically solved by the finite volume method with a second order spatiotemporal discretization. The Prandtl, the Reynolds and the Grashof numbers are fixed at 8.082, 399.02 and 12801 respectively. The obtained results showed that the axial Nusselt number increases with the increasing of number of fins. Moreover, the longitudinal fins configuration showed a more significant improvement in heat transfer than that of the transverse fins.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45509177","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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