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  

作　　者：Yu-Liang Sun Davood Toghraie Omid Ali Akbari Farzad Pourfattah As’ad Alizadeh Navid Ghajari Mehran Aghajani 

机构地区：[1]School of Science,Huzhou University,Huzhou 313000,China [2]Department of Mechanical Engineering,Khomeinishahr Branch,Islamic Azad University,Khomeinishahr,Iran [3]Young Researchers and Elite Club,Khomeinishahr Branch,Islamic Azad University,Khomeinishahr,Iran [4]Department of Mechanical Engineering,University of Kashan,Kashan,Iran [5]Department of Mechanical Engineering,College of Engineering,University of Zakho,Zakho,Iraq

出　　处：《Chinese Journal of Chemical Engineering》2022年第2期450-464,共15页中国化学工程学报（英文版）

摘　　要：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 states.Studied geometry is a two-dimensional microchannel under the influence of nanofluid jet injection.Temperature of inlet fluid equals with Tc=293 K and hot source of microchannel is under the influence of oscillating heat flux.Also,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 investigated.Obtained results indicate that the increase of Reynolds number,nanoparticles mass fraction and attack angle of rib leads to the increase of pressure drop.By increasing fluid viscosity,momentum depreciation of fluid in collusion with microchannel surfaces enhances.Also,the increase of attack angle of rib at higher Reynolds numbers has a great effect on this coefficient.At 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 similar.By increasing fluid velocity,the effect of the variations of attack angle on pressure drop becomes significant and pressure drop figures act differently.In 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 

分 类 号：TQ021[化学工程] TB383.1[一般工业技术—材料科学与工程]