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首页> 外文期刊>Energy Conversion & Management >Experimental study of the characteristics of solidification of stearic acid in an annulus and its thermal conductivity enhancement
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Experimental study of the characteristics of solidification of stearic acid in an annulus and its thermal conductivity enhancement

机译：硬脂酸在环空中的凝固特性及其热导率增强的实验研究

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摘要

The thermal and heat transfer characteristics of stearic acid during the solidification processes were investigated experimentally in a vertical annulus energy storage system. The temperature distribution and temperature variations with time at different radial positions during the freezing processes were obtained. The thermal characteristics of the stearic acid, including movement of the solid liquid interface in the radial direction, and the effects of Reynolds number on the heat transfer parameters were studied. The heat flux was estimated by using a simple approximate model. A new copper fin was designed and fixed to the electrical heating rod to enhance the thermal conductivity of the stearic acid. The results show that the new fin can enhance both the conduction and the natural convection heat transfer of the PCM, and the enhancement factor during solidification is estimated to be as high as 250%. The effect of the fin width on the enhancement was also examined experimentally, and it is found that the fine fin usually produce more effective enhancement.
机译：在垂直环形储能系统中，对硬脂酸在凝固过程中的传热和传热特性进行了实验研究。获得了冷冻过程中不同径向位置的温度分布和温度随时间的变化。研究了硬脂酸的热特性，包括固液界面在径向上的运动，以及雷诺数对传热参数的影响。通过使用简单的近似模型估算热通量。设计了一个新的铜翅片，并将其固定在电加热棒上，以提高硬脂酸的导热性。结果表明，新翅片可同时增强PCM的传导和自然对流换热，并且固化过程中的增强因子估计高达250％。还通过实验检查了翅片宽度对增强的影响，并且发现细翅片通常产生更有效的增强。

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