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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal characteristics of paraffin in a spherical capsule during freezing and melting processes
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Thermal characteristics of paraffin in a spherical capsule during freezing and melting processes

机译：球形胶囊在冷冻和融化过程中的热特性

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摘要

The objective of the present study was to investigate the thermal characteristics of paraffin in a spherical capsule during freezing and melting processes. Experiments were performed with paraffin, i.e., n-tetradecane, and a mixture of n-tetradecane (40/100) and n-hexadecane (60/100) and water. The parameters were the Reynolds number and the inlet temperature during the freezing process and initial temperature during the melting process for a PCM-thermal- storage system. The phase-change period for the capsule at the edge of a storage tank was shorter than that at the center of the storage tank due to smaller porosity at the center than the edge of the storage tank. Water showed a bigger of subcooling than paraffin. lt took longer for water to reach the dimensionless thermal-storage capacity of l during the freezing process, and shorter during the melting process than that for paraffin. The average heat-transfer coefficients were affected by the inlet or initial temperature and Reynolds number more during the melting process than during the freezing process due to a natural-convention effect during the melting process. The average heat- transfer coefficients for paraffin were larger by a maximum of 40/100 than those the water during the freezing and melting processes.
机译：本研究的目的是研究球形胶囊在冷冻和融化过程中的热特性。用石蜡，即正十四烷以及正十四烷（40/100）和正十六烷（60/100）的混合物和水进行实验。这些参数是PCM蓄热系统的雷诺数和冷冻过程中的入口温度，以及融化过程中的初始温度。由于在中心处的孔隙率比在储罐的边缘小，所以在储罐的边缘的胶囊的相变周期比在储罐的中心的相变周期短。与石蜡相比，水的过冷度更大。与石蜡相比，在冷冻过程中水达到l的无量纲蓄热能力需要更长的时间，而在融化过程中则需要更短的时间。由于在熔化过程中的自然约定效应，在熔化过程中，平均传热系数受入口温度或初始温度和雷诺数的影响要大于冻结过程中的雷诺数。在冷冻和融化过程中，石蜡的平均传热系数最大比水大40/100。

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