The change of sound velocity with pressure, dryness degree, void-fraction, and phase-transition coefficient are analyzed. Some important conclusions are derived.
分析了两相流体中音速随压力、干度、汽隙率、相变系数等的变化关系，并从中得出了一些重要的结论。
The relation of bubble nucleation rate and degree of superheat, and phase change driving force and phenomenological coefficient, were analyzed based on phenomenological theory, respectively.
基于唯象理论，分析了汽泡核化速率和过热度以及相变驱动力和唯象系数的关系。
When the battery surface temperature is in the phase change temperature range, the cooling effect is not obvious by continuing increasing material thickness and convective heat transfer coefficient.
当电池表面温度处于相变材料的相变温度区间时，继续增加材料厚度和对流换热系数散热效果不显著；
When the battery surface temperature is in the phase change temperature range, the cooling effect is not obvious by continuing increasing material thickness and convective heat transfer coefficient.
当电池表面温度处于相变材料的相变温度区间时，继续增加材料厚度和对流换热系数散热效果不显著；
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