摘要
与通常的东法不同，本文从微元封闭体系的简单模型出发，推导出微小扰动在流体介质中的相对传播速率－音速为ａ＾２＝（δｐ／δｐ）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〈ａ〈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 through differential closed system, the formula of acoustic speed, namely a2 = (■p/■p)s can be derived. This approach is better than the method with differential control volume, because it is more clear to express the essence about propagation of small disturbances in fluids. It is demonstrated that if special condition expressed by equation (26) is satisfied, a minimum acoustic speed in homogeneous two-phase exists, otherwise there is no such a minimum acoustic speed. The analysis and conclusions in this paper are agree well with the experiments.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2000年第5期623-627,共5页
Journal of Engineering Thermophysics
关键词
双相流体
冻结音速
微小扰动
流体介质
two-phase fluids, frozen acoustic speed
minimum acoustic speed, void fraction
