气泡破裂及其夹带特性行为测量综述

Review of Measurement Method for Bubble Rupture and Entrainment Behavior

自由液面处气泡破裂造成的液滴夹带现象广泛存在于水冷反应堆中,在事故工况下液池中滞留的气溶胶可通过夹带的方式进入气相中,对释放量的准确计算是源项评估的重要基础。气溶胶最终的释放特性由气泡寿命、液膜厚度及产生的液滴尺寸等参数决定。由于气泡破裂是一复杂且随机的过程,因此液相表面气泡破裂关键参数的测量没有普遍适用的方法,且各方法的测量结果并不互相适用,这就给气溶胶释放特性的研究带来困难。为对该现象进行研究,本文总结了上述物理参数的多种测量方法及部分经验公式,比较了不同测量方法的适用范围,最后展望适用于此领域的测量方法及后续的研究方向。

The phenomenon of droplet entrainment caused by bubble rupture at the free liquid surface exists widely in water-cooled reactors.Under accident conditions,the aerosol detained in the liquid pool can be transferred into the air by entrainment.Accurate calculation of the release amount is an important basis for the evaluation of the source term.The final release characteristics are directly determined by parameters such as bubble lifetime,liquid film thickness,and droplet size etc.Owing to complex and random process of bubble rupture,there is no universally applicable method for measuring the crucial parameters of bubble rupture on the liquid surface,and the results are not applicable to each other.This brings great difficulties to the evaluation of the release characteristics of the final source term.In order to investigate this phenomenon,the measurement methods of the above physical parameters and some empirical formulas were summarized.The applicable scope of different methods was compared.Finally,various measurement schemes and subsequent research directions for bubble rupture behavior were summarized and prospected.