DOUBLE DIFFUSIVE MIXED CONVECTION HEAT TRANSFER INSIDE A VENTED SQUARE CAVITY

Chemical Engineering Research Bulletin Pub Date : 2009-10-04 DOI:10.3329/CERB.V13I1.2512

S. Saha, M. Hasan, I. Khan

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引用次数: 20

Abstract

A numerical study has been carried out for laminar double-diffusive mixed convection in a two-dimensional vented square cavity with discrete heat and contaminant sources applied on the bottom wall. An external air flow enters the cavity through an opening located at the bottom of the left vertical wall and exits from an opening located at the three different positions of the opposite wall. The developed mathematical model is governed by the two-dimensional continuity, momentum, energy, and concentration equations. The governing equations, written in non-dimensional form are solved by using Galerkin finite element method with triangular grid discretization system. The Reynolds number is fixed at 100 and the working fluid is considered as air. Numerical simulations are carried out for different combinations of the thermal Grashof numbers and results are presented in terms of streamlines, temperature and concentration distributions. The results indicate that the average Nusselt and Sherwood numbers on the heat and contaminant sources strongly depend on the positioning of the exit opening. Keywords: double diusive mixed convection, vented cavity, finite element DOI = 10.3329/cerb.v13i1.2512 Chemical Engineering Research Bulletin 13 (2009) 17-24

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方形通风腔内双扩散混合对流换热

本文对二维方形通风腔内的层流双扩散混合对流进行了数值研究。外部气流通过位于左侧垂直壁底部的开口进入空腔，并从位于相对壁的三个不同位置的开口出口。所建立的数学模型由二维连续性、动量、能量和浓度方程控制。用三角网格离散系统的伽辽金有限元法求解了无量纲形式的控制方程。雷诺数固定为100，工作流体被认为是空气。对不同组合的热格拉绍夫数值进行了数值模拟，并从流线、温度和浓度分布等方面给出了结果。结果表明，热源和污染源的平均努塞尔数和舍伍德数与出口开口的位置密切相关。关键词:双di射流混合对流，排气腔，有限元DOI = 10.3329/cerb.v13i1.2512化学工程研究通报13 (2009)17-24

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Chemical Engineering Research Bulletin

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