| 管内进口段对流换热过程不可逆性的数值模拟 |
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| 引用本文： | 吴双应,李友荣,曾丹苓.管内进口段对流换热过程不可逆性的数值模拟[J].化工学报,2005,56(4):602-607. |
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| 作者姓名： | 吴双应 李友荣 曾丹苓 |
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| 作者单位： | 重庆大学动力工程学院，重庆 400044 |
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| 基金项目： | 国家重点基础研究规划项目 (2000026300).~~ |
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| 摘 要： | The irreversibility due to laminar forced convection in the entrance region of a duct was studied by means of numerical simulation. Local entropy generation distributions and total entropy generation were obtained based on the entropy generation equation. The effect of Reynolds number on the irreversibility was studied for constant wall temperature and heat flux. The results showed that the irreversibility in the entrance region was different from that in the fully developed region. Reynolds number had a strong effect on the irreversibility in the entrance region. The entropy generation caused by temperature difference was relatively dominant over that caused by viscous flow. The irreversibility at constant wall temperature was different from that at constant wall heat flux.
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| 关 键 词： | 层流换热 进口段 熵产 数值模拟 |
| 文章编号： | 0438-1157(2005)04-0602-06 |
| 收稿时间： | 2004-6-11 |
| 修稿时间： | 2004-9-28
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Numerical simulation of irreversibility due to forced convection in entrance region of duct |
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| WU Shuangying,LI Yourong,ZENG Danling.Numerical simulation of irreversibility due to forced convection in entrance region of duct[J].Journal of Chemical Industry and Engineering(China),2005,56(4):602-607. |
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| Authors: | WU Shuangying LI Yourong ZENG Danling |
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| Abstract: | The irreversibility due to laminar forced convection in the entrance region of a duct was studied by means of numerical simulation.Local entropy generation distributions and total entropy generation were obtained based on the entropy generation equation. The effect of Reynolds number on the irreversibility was studied for constant wall temperature and heat flux.The results showed that the irreversibility in the entrance region was different from that in the fully developed region.Reynolds number had a strong effect on the irreversibility in the entrance region.The entropy generation caused by temperature difference was relatively dominant over that caused by viscous flow.The irreversibility at constant wall temperature was different from that at constant wall heat flux. |
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| Keywords: | laminar forced convection entrance region entropy generation numerical simulation |
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