与通常的方法不同，本文从微元封闭体系的简单模型(而非微元控制体)出发，推导出微小扰动在流体介质中的相对传播速率---音速为a2=(p/ρ)s, 并强调指明该式对于双相流体介质的适用条件。对于均匀双相流体的冻结音速，文中从理论上分析并导出了存在最小音速(气隙率0<α<1))的条件及此时的气隙率的计算公式，这些理论分析的结果是与已知的实验数据相符的
From a simple and effect model for propagation of small disturbances throughdifferential closed system, the formula of acoustic speed, namelya2=(p/ρ)s can be derived. This approach is better thanthe method with differential control volume, because it is more clear toexpress the essence about propagation of small disturbances in fluids. It is demonstrated that if special condition expressed by equation (26) issatisfied, a minimum acoustic speed in homogeneous two-phase exists, otherwisethere is no such a minimum acoustic speed. The analysis and conclusions in thispaper are agree well with the experiments
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