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将Helmhotz共振腔应用于换热器来增强换热是一种新的强化换热方法。本文作者通过实验研究了Helmhotz共振腔对换热器的换热强化效果,分析了各种参数对换热效果的影响,得到了对流换热系数及换热强化比随流速的变化规律,结果对工程设计及进一步的研究具有重要的指导意义。 相似文献
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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. 相似文献
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