槽道表面沸腾强化传热机理研究

STUDY ON ENHENCING HEAT TRANSFER OF GROOVE SURFACE BOILING

本文以不定常传热理论为基础,对槽道表面沸腾传热进行了理论分析研究。分析了气泡的生长规律,建立了气泡壁面微层液膜的流动和传热的物理和数学模型,并与气泡顶部液体的不定常传热联系起来,得到了气泡生长和传热关系式。并且由几个约束性条件,对槽道的几何尺寸进行了判定,提出了适用的槽深和槽宽的变化范围,可供设计时参考。利用本文的关系式,对水蒸气和氟致冷剂(CFC)进行了数值计算,并与实验结果进行比较,两者基本一致。

Based on the theory of unsteady heat transfer, the enhancement of boiling heat transfer on groove surface is studied theoretically and analitically. The groth of a bubble in groove surface is analysed, and the physical and mathematical models of flow and heat transfer of liquid microfilm in the groove wall are presented, and the equation for growth and heat transfer of a bubble are obtained in consideration of unsteady flow and heat transfer of liquid above the bubble. Based on some known limited conditions, the groove dimensions are analysed and the variable ranges of its width and depth, which may be useful in the engineering design, are presented. Finally, steam and refrigerants (CFC) are used as the cases for approving the models given, and the results calculated are in good agreement with the experimental data.