Numerical study of heat transfer and flow structure over a microscale backstep

被引：8

作者：

Hajji, Hassnia ^{[1
]}

Kolsi, Lioua ^{[2
]}

Ghachem, Kaouther ^{[3
]}

Maatki, Chemseddine ^{[4
]}

Hussein, Ahmed Kadhim ^{[5
]}

Borjini, Mohamed Naceur ^{[1
]}

机构：

[1] Univ Monastir, Natl Engn Sch Monastir, Lab Metrol & Energy Syst, Monastir, Tunisia

[2] Hail Univ, Coll Engn, Dept Mech Engn, Hail, Saudi Arabia

[3] Princess Nourah bint Abdulrahman Univ, Coll Engn, Dept Ind Engn & Syst, Riyadh, Saudi Arabia

[4] Al Imam Mohammad Ibn Saud Islamic Univ, Coll Engn, Dept Mech Engn, Riyadh, Saudi Arabia

[5] Univ Babylon, Dept Mech Engn, Babylon, Hilla, Iraq

来源：

ALEXANDRIA ENGINEERING JOURNAL | 2021年 / 60卷 / 03期

关键词：

Micro fluidics; Sudden expansion microchannel; Reynolds number; Nusselt number; BACKWARD-FACING STEP; FORCED-CONVECTION; FLUID-FLOW; MICROCHANNEL; SIMULATION; BIFURCATION; TRANSITION; TRANSPORT; DEVICES;

D O I：

10.1016/j.aej.2021.01.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study presents a two and three-dimensional numerical simulations of a flow-through a sudden expansion and contraction microchannels. The finite element method was used to discretize the equations governing the physical model. By carrying out the numerical simulations, results indicate the apparition of a separate vortex, situated in the corner after the sudden expansion of the microchannel for low Reynolds numbers. For high values of Reynolds number and expansion ratios, the vortex separation length increases. Also, the three-dimensional character of the flow is more pronounced for higher Reynolds numbers. (C) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页码：2759 / 2768

页数：10

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