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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Growth Rate of Crystallization in Disodium Hydrogenphosphate Dodecahydrate
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Growth Rate of Crystallization in Disodium Hydrogenphosphate Dodecahydrate

机译：十二水磷酸氢二钠中结晶的生长速率

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摘要

The solidification process of clisodium hydrogenphosphate dodecahydrate was investigated to develop long-term latent heat storage that uses supercooling. Supercooled thermal energy storage (Super-TES) stores thermal energy at temperatures lower than the melting point of the phase-change material (PCM), thus reducing the heat loss from the storage system. During nucleation and solidification, the temperature of PCM is not constant in Super-TES. The solidification process in Super-TES, therefore, influences the performance of the storage system because thermal properties of PCM, strongly depend on the temperature and phase of the material. The results show that the growth rate of the hydrate increased with increasing degree of supercooling and that this growth rate was slow compared with that of metals. When the degree of supercooling was less than about 10 K, the crystal of the hydrate grew like a single crystal, and the growth rate was approximately proportional to the third power of the degree of supercooling. Because the viscosity of the hydrate in the liquid phase below the melting point increased drastically, when the degree of supercooling exceeded about 10 K, the crystal grew like a dendritic crystal, and the increase in the growth rate with increasing degree of supercooling decreased.
机译：研究了十二水合磷酸氢二钠的凝固过程，以开发利用过冷的长期潜热存储。过冷的热能存储（Super-TES）在低于相变材料（PCM）熔点的温度下存储热能，从而减少了存储系统的热损失。在成核和固化过程中，Super-TES中PCM的温度不是恒定的。因此，Super-TES中的固化过程会影响存储系统的性能，因为PCM的热性能很大程度上取决于材料的温度和相。结果表明，水合物的生长速率随着过冷度的增加而增加，并且与金属相比，其生长速率慢。当过冷度小于约10K时，水合物的晶体像单晶一样生长，并且生长速率大约与过冷度的三次方成正比。因为低于熔点的液相中水合物的粘度急剧增加，所以当过冷度超过约10K时，晶体像树枝状晶体一样生长，并且随着过冷度增加，生长速率的增加降低。

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