Effect of the vortical structure on heat transfer in the transitional flow over a backward-facing step

被引：22

作者：

Xie, W. A. ^{[1
]}

Xi, G. N. ^{[2
]}

Zhong, M. B. ^{[3
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai 200240, Peoples R China

[2] Nantong Univ, Sch Mech Engn, Nantong 226019, Peoples R China

[3] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2017年 / 74卷

基金：

中国国家自然科学基金;

关键词：

Backward-facing step; Transitional flow; Vortical structure; Nusselt number; FORCED-CONVECTION; NUMERICAL-SIMULATION; NANOFLUID FLOW; TURBULENT-FLOW; CYLINDER; LAMINAR; ADJACENT; HEIGHT; BUBBLE; MASS;

D O I：

10.1016/j.ijrefrig.2016.11.001

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This paper presents a direct numerical simulation of the vortical structure along the bottom wall and its effect on heat transfer enhancement in the transitional flow over a backward facing step. The governing equations are solved with a computer program using FORTRAN code according to finite volume method. The heat transfer of the bottom wall is enhanced greatly for the transitional Reynolds numbers, especially in the range 6 <= x/H <= 14. In this range, the local Nusselt number distributions for various time instants of the periodic cycle exist three peak values at Re = 1200. The corresponding locations of Nu peak values in the vorticity contours are all between the negative vortex and the adjacent downstream positive vortex. This vortical structure appears due to the flow instability which causes the heat transfer enhancement of the bottom wall in the transitional flow. (C) 2016 Elsevier Ltd and IIR. All rights reserved.

引用

页码：465 / 474

页数：10

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