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首页> 外文会议>2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring >Second Law Optimization of Pin Fin Heat Exchangers with Lateral Ejection Holes
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Second Law Optimization of Pin Fin Heat Exchangers with Lateral Ejection Holes

机译：带侧面喷射孔的翅片式换热器的第二定律优化

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摘要

The authors theoretically studied the entropy generation during heat transfer of a pin fin array in channels with lateral ejection holes for a turbine blade. The entropy generation model was established based on the second-law analysis. The distribution of the entropy generation due to heat transfer and fluid friction irreversibility respectively was analyzed and a comparison was made for three typical short pin fin channels. The entropy generation number component due to heat transfer decreases while Red increases, while the component due to fluid friction increases with the increase of Red. The entropy generation number takes its minimum value when the two components meet and the corresponding Reynolds number is optimal. The ejection holes influence the energy lost of the working fluid. For the three cases studied in the paper, case b with short ejection holes gives the best comprehensive thermal performance with comparison to cases with no and long ejection holes. The results would be helpful for the design of the heat dissipation of pin fin heat exchangers.
机译：作者从理论上研究了在涡轮叶片带有侧向喷孔的通道中的销翅片阵列传热过程中的熵产生。在第二定律分析的基础上建立了熵产生模型。分析了分别由于传热和流体摩擦不可逆而产生的熵的分布，并比较了三个典型的短销翅片通道。由于热传递而产生的熵产生数分量随Red的增加而减小，而随着流体摩擦的分量随Red的增加而增大。当两个分量相遇且相应的雷诺数为最佳时，熵生成数取其最小值。喷射孔影响工作流体的能量损失。对于本文中研究的三种情况，与不具有长喷射孔的情况相比，具有短喷射孔的情况b具有最佳的综合热性能。研究结果对针翅式换热器的散热设计有帮助。

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