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Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

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Chinese Journal of Chemical Engineering 2020年第3期28卷 643-659页

作者： Milad Gholami Mohammad Reza Nazari Mohammad Hossien Talebi farzad pourfattah Omid Ali Akbari Davood Toghraie Department of Mechanical Engineering Yazd UniversityYazdIran School of Mechanical Engineering Science&Arts UniversityYazdIran Mechanical Engineering Department University of Kashan KashanIran Young Researchers and Elite Club Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran

In this numerical study,natural flow and heat transfer of nanofluids with Al2O3,TiO2,Cu and CNT nanoparticles in a vertical channel with dimpled fins at Rayleigh number(Ra)of Ra=3.25×107 to Ra=1×108 are investigated by using the finite volume *** obtained results revealed that,using CNT in volume fractions of 2%and 4%leads to significant heat transfer and atφ=6%,using TiO2 nanoparticles has a great effect on Nu number ***,using solid nanoparticles in base fluid causes more uniform heat transfer distribution,especially in areas close to heated surface and by adding more volume fraction in base fluid,temperature level *** general,according to temperature contours,reduction of wall temperature depends on the increase of Ra and volume fraction and the type of solid nanoparticles.

关键词： Natural heat transfer Dimpled fins Rayleigh number Nanofluid

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Thermal performance and entropy generation for nanofluid jet injection on a ribbed microchannel with oscillating heat flux: Investigation of the first and second laws of thermodynamics

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Chinese Journal of Chemical Engineering 2022年第2期35卷 450-464页

作者： Yu-Liang Sun Davood Toghraie Omid Ali Akbari farzad pourfattah As’ad Alizadeh Navid Ghajari Mehran Aghajani School of Science Huzhou UniversityHuzhou 313000China Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Young Researchers and Elite Club Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering University of KashanKashanIran Department of Mechanical Engineering College of EngineeringUniversity of ZakhoZakhoIraq

In current numerical study,forced flow and heat transfer of water/NDG(Nitrogen-doped graphene)nanofluid in nanoparticles mass fractions(φ)of 0,2%and 4%at Reynolds numbers(Re)of 10,50,100 and 150 are simulated in steady *** geometry is a two-dimensional microchannel under the influence of nanofluid jet *** of inlet fluid equals with Tc=293 K and hot source of microchannel is under the influence of oscillating heat ***,in this research,the effect of the variations of attack angle of triangular rib(15°,30°,45°and 60°)on laminar nanofluid flow behavior inside the studied rectangular geometry with the ratio of L/H=28 and nanofluid jet injection is *** results indicate that the increase of Reynolds number,nanoparticles mass fraction and attack angle of rib leads to the increase of pressure *** increasing fluid viscosity,momentum depreciation of fluid in collusion with microchannel surfaces ***,the increase of attack angle of rib at higher Reynolds numbers has a great effect on this *** low Reynolds numbers,due to slow motion of fluid,variations of attack angle of rib,especially in angles of 30°,45°and 60°are almost *** increasing fluid velocity,the effect of the variations of attack angle on pressure drop becomes significant and pressure drop figures act *** general,by using heat transfer enhancement methods in studied geometry,heat transfer increases almost 25%.

关键词： Ribbed microchannel Forced heat transfer Numerical study Nanofluid Attack angle of rib

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