Hydrothermal performance analysis of various surface roughness configurations in trapezoidal microchannels at slip flow regime  

作　　者：Davood Toghraie Ramin Mashayekhi Mohammadreza Niknejadi Hossein Arasteh 

机构地区：[1]Department of Mechanical Engineering,Khomeinishahr Branch,Islamic Azad University,Khomeinishahr,Iran [2]Young Researcher and Elite Club,Khomeinishahr Branch,Islamic Azad University,Khomeinishahr,Iran [3]Department of Mechanical Engineering,Isfahan University of Technology,Isfahan,Iran

出　　处：《Chinese Journal of Chemical Engineering》2020年第6期1522-1532,共11页中国化学工程学报（英文版）

摘　　要：The effects of various surface roughness geometrical properties including roughness height(5%,10%,15%),number(3,6),and shape(rectangular and triangular)on the flow and heat transfer of slip-flow in trapezoidal microchannels were investigated.The effects of mentioned parameters on the heat transfer coefficient through the microchannel,average Nusselt number and pressure drop for Reynolds number of 5,10,15 and 20 were examined.The obtained results showed that increasing the roughness height and number increases the pressure drop due to higher stagnation effects before and after roughness elements and decreases the Nusselt number due to higher recirculation zones effects than obstruction effects.The most reduction in Nusselt number and the most increment in pressure drop occur at the roughness height of 15%,roughness number of 6 and Reynolds number of 20 by about 10.6%and 52.8%than the smooth microchannel respectively.

关 键 词：MICROCHANNEL Slip flow regime Surface roughness Trapezoidal cross-section 

分 类 号：O647[理学—物理化学]