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Title of Journal: Appl Math MechEngl Ed

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Abbravation: Applied Mathematics and Mechanics

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Shanghai University

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DOI

10.1002/phbl.19780340805

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1573-2754

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Effect of Richardson number on entropy generation

Authors: Sheng Chen
Publish Date: 2012/11/08
Volume: 33, Issue: 11, Pages: 1431-1440
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Abstract

The flow over a backward facing step BFS has been taken as a useful prototype to investigate intrinsic mechanisms of separated flow with heat transfer However to date the open literature on the effect of Richardson number on entropy generation over the BFS is absent yet although the flow pattern and heat transfer characteristic both will receive significant influence caused by the variation of Richardson number in many practical applications such as in microelectromechanical systems and aerocrafts The effect of Richardson number on entropy generation in the BFS flow is reported in this paper for the first time The entropy generation analysis is conducted through numerically solving the entropy generation equation The velocity and temperature which are the inputs of the entropy generation equation are evaluated by the lattice Boltzmann method It is found that the distributions of local entropy generation number and Bejan number are significantly influenced by the variation of Richardson number The total entropy generation number is a monotonic decreasing function of Richardson number whereas the average Bejan number is a monotonic increasing function of Richardson numberProject supported by the National Natural Science Foundation of China Nos 51176061 and 51006043 the Research Foundation for Outstanding Young Teachers of Huazhong University of Science and Technology No 2012QN168 and the Research Fund for the Doctoral Program of Higher Education of China No 20100142120048

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