Laminar forced convection flow over a backward facing step using nanofluids

被引:112
作者
Al-aswadi, A. A. [1 ]
Mohammed, H. A. [1 ]
Shuaib, N. H. [1 ]
Campo, Antonio [2 ]
机构
[1] Univ Tenaga Nas, Coll Engn, Dept Mech Engn, Kajang 43009, Selangor, Malaysia
[2] Univ Texas San Antonio, Dept Mech Engn, San Antonio, TX 78249 USA
关键词
Forced convection; Backward facing step; Heat transfer enhancement; Nanofluids; Recirculation flow; HEAT-TRANSFER DOWNSTREAM; MIXED CONVECTION; INCLINATION ANGLE; ADJACENT; DUCT;
D O I
10.1016/j.icheatmasstransfer.2010.06.007
中图分类号
O414.1 [热力学];
学科分类号
摘要
Laminar forced convection flow of nanofluids over a 2D horizontal backward facing step placed in a duct is numerically investigated using a finite volume method. A 5% volume fraction of nanoparticles is dispersed in a base fluid besides using various types of nanoparticles such as Au, Ag, Al2O3, Cu, CuO, diamond, SiO2, and TiO2. The duct has a step height of 4.8 mm, and an expansion ratio of 2. The Reynolds number was in the range of 50 <= Re <= 175. A primary recirculation region has been developed after the sudden expansion and it starts to change to become fully developed flow downstream of the reattachment point The reattachment point is found to move downstream far from the step as Reynolds number increases. Nanofluid of SiO2 nanoparticles is observed to have the highest velocity among other nanofluids types, while nanofluid of Au nanoparticles has the lowest velocity. The static pressure and wall shear stress increase with Reynolds number and vice versa for skin friction coefficient. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:950 / 957
页数:8
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