Analysis of solid-liquid phase change heat transfer enhancement

Yin-ping Zhang, Xin Wang
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引用次数: 4

Abstract

Solid-liquid phase change processes have two important features: the process is an approximately isothermal process and the heat of fusion of phase change material tends to be much greater than its specific heat. Therefore, if any phase change material adjacent to a hot or cold surface undergoes phase change, the heat transfer rate on the surface will be noticeably enhanced. This paper presents a novel insight into the mechanisms of heat transfer enhancement induced by solid-liquid phase change based on the analogy analysis for heat conduction with an internal heat source and solid-liquid phase change heat transfer. Three degrees of surface heat transfer enhancement for different conditions are explored, and corresponding formulae are written to describe them. The factors influencing the degrees of heat transfer enhancement are clarified and their effects quantitatively analyzed. Both the novel insight and the analysis contribute to effective application of phase change heat transfer enhancement technique.
固液相变强化传热分析
固液相变过程有两个重要的特点:相变过程是近似等温过程,相变材料的熔合热往往远大于其比热。因此,如果与热或冷表面相邻的任何相变材料发生相变,则表面的传热速率将显著提高。本文通过对内热源热传导和固液相变传热的类比分析,对固液相变强化传热机理进行了新的认识。探讨了不同条件下的3个表面传热强化度,并给出了相应的表达式。阐明了影响传热强化程度的因素,并定量分析了它们的作用。这一新的认识和分析有助于相变强化传热技术的有效应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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