Latent Cold Heat Energy Storage Characteristics by means of Direct-Contact-Freezing between Oil Droplets and Cold Water Solution
Latent Cold Heat Energy Storage Characteristics by means of Direct-Contact-Freezing between Oil Droplets and Cold Water Solution
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DOI：
10.1016/s0017-9310(96)00366-3
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发表时间：
1997-09
影响因子：
5.2
通讯作者：
H. Inaba;Sato Kenji
中科院分区：
文献类型：
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作者：
H. Inaba;Sato Kenji
实验研究了石蜡油滴（熔点为5.8°C、熔化潜热为229.1 kJ/kg、6°C时密度为770 kg/m3的十四烷）在冷水溶液中上升时的流动和凝固特性。十四烷油从圆柱形单孔喷嘴喷射到冷水溶液中，并且其分散并形成微小油滴。油滴通过浮力在水溶液中上升，并通过与冷水溶液直接接触热交换而冻结。最后，它们被完全或部分冻结。部分冻结的油滴由冻结的外壳和未冻结的中心核组成。其结果是，它被发现的凝固分数的冻结油滴，定义为凝固部分的质量比的整体，增加与注射油温度和水溶液温度的降低。而在较低温度条件下，注入油在喷嘴出口处发生凝固，凝固分数随注入油温度和水溶液温度的降低而降低。提出了一种凝固分数的数据处理方法，并建立了预测凝固分数的无量纲经验方程。
Flow and solidification characteristics of paraffin oil droplets (tetradecane with the melting point of 5.8°C, the latent heat of fusion of 229.1 kJ/kg and the density of 770 kg/m3at 6°C) ascending in a cold water solution are experimentally investigated. The tetradecane oil is injected from a cylindrical single hole nozzle into the cold water solution and it disperses and forms tiny oil droplets. The oil droplets ascend in the water solution by buoyancy and freeze by direct-contact heat exchange with the cold water solution. Finally, they are completely or partially frozen. The partially frozen oil droplet is composed of a frozen outer shell and unfrozen central core. As a result, it was found that the solidification fraction of the frozen oil droplets, defined as mass ratio of the solidified parts to the whole, increases with a decrease in injection oil temperature and water solution temperature. However, under a lower temperature condition, the injected oil freezes at the outlet of the nozzle, and the solidification fraction reduces with a decrease in injection oil temperature and water solution temperature. A method of data reduction for the solidification fraction is proposed and non-dimensional empirical equations to predict the solidification fraction are proposed in this study.