Influence of heat flux and Reynolds number on the entropy generation for different types of nanofluids in a hexagon microchannel heat sink

作     者：A.A.Alfaryjat A.Dobrovicescu D.Stanciu 

作者机构：Faculty of Mechanical Engineering and Mechatronics University Politehnica of Bucharest Splaiul Independentei nr.313 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报(英文版))

年 卷 期：2019年第27卷第3期

页      面：501-513页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080701[工学-工程热物理] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the Politehnica University of Bucharest in Romania for supporting this project ?nancially 

主　　题：Microchannel heat sink Nanofluids Entropy generation Numerical analysis Laminar flow 

摘      要：Based on the Second Law of Thermodynamics, the entropy generation is studied for laminar forced convection flow of different nanoparticles(AlO, CuO and SiO) mixed with water through a hexagon microchannel heat sink(HMCHS). The effects of different heat fluxes and Reynolds numbers on the entropy generation for different nanofluids, volume fractions and nanoparticles diameter are investigated. The heat flux is in the range of 125 to 500 kW·mand the Reynolds numbers vary between 200 and 1500. The thermal, frictional and total entropy generations are calculated by integrating the volumetric rate components over the entire HMCHS. The results clearly show that the rise in the heat flux leads to an increase in the thermal entropy generation for nanofluids and pure water but they don’t have any influence on the frictional entropy generation. Moreover, when the Reynolds number increases, the frictional entropy generation increases while the thermal entropy generation decreases. The results revealed that at low heat fluxes and high Reynolds numbers, pure water gives the lowest entropy generation, while at high heat flux the nanofluid has to be used in order to lower the overall irreversibility.