气液两相流中的声速研究

Study on the sound velocity in a gas-liquid flow

气液两相流在工业各领域中广泛存在,而声速是描述其声学性质的一个重要参数。本文从流体的体积弹性模量的定义出发,推导了气液两相流中的声速随含气率的变化关系式,即混合流体的Wood声速公式,将其声速的部分计算结果和其他作者的实验数据进行了比较,吻合良好。并通过COMSOL有限元模拟软件得到不同气体分布下圆管谐振腔最低阶模式的共振频率,间接数值模拟研究了含气率对声速的影响。模拟结果与理论计算结果一致,当气液两相流中含气率较低时,声速随含气率的增大急剧减小。本研究结果为确定声速与气液两相流中的含气率间的关系提供了参考依据。

Gas-liquid flows exist in various industry fields. One of the important parameters to describe gas-liquid flows is sound velocity. The relationship of the sound velocity and the gas rate in a gas-liquid flow is derived from the definition of the fluid bulk modulus. The calculated results and the experimental results by Henry are in good agreement. And the pipe resonance frequency of the lowest order mode under the different gas distribution is received by COMSOL finite element simulation software. The effects of gas rate on the sound velocity are indirectly numerically studied. Simulation results are consistent with the theoretica Gas-liquid flows exist in various industry fields. One of the important parameters to describe gas-liquid flows is the sound velocity.1 results. When gas exists in a gas-liquid flow even in a low gas rate, the sound velocity decreases sharply. This study offers a reference for the determination of the relationship of the sound velocity and the gas rate in a gas-liquid flow.