Microscopic and Macroscopic Modelling of Multi-Phase Flows

本研究是对时变压力场中气泡尺寸振荡的理论和实验研究。以前的分析将扩展到包括气体溶解度的影响，这对高溶解度气体或低溶解度气体变得重要，但压力波动幅度很大。从微观角度对气泡动力学的研究结果将被用来推导出适用于气泡液体和雾体中压力波的宏观(平均)方程。这项研究应有助于提高预测可能发生相变的两相流的能力，如反应堆热工液压系统和意外泄漏中的相变。它还应该用于空化、超声波的医疗应用和超声波清洗。

This research is a theoretical and experimental study of bubble size oscillations in time varying pressure fields. Previous analysis will be extended to include the influence of gas solubility which becomes important for highly soluble gases or for low solubility gases but at large amplitude pressure fluctuations. The results for bubble dynamics from this microscopic view point will be used to derive suitable macroscopic (averaged) equations for pressure waves in bubbly liquids and fogs. The research should lead to improved capability for predicting two phase flows with possible phase change such as occurs in reactor thermal hydraulic systems and in accidental releases. It should also be of use for cavitation, medical applications of ultrasound, and ultrasonic cleaning.