超声空化泡相界面逸出时相间传质的研究

根据超声空化泡在相间特殊运动时周围流体流动特性，以相间传质渗透理论为依据，结合流体动力学原理，分析了超声空化泡在相间的传质过程，由此建立了超声波声空化气泡相界面逸出时相间传质数学关系式，该式表明，超声功率可使传质系数增加，传质系数不仅与超声波声强近似呈线性关系，而且与扩散系数、气泡的气体体积流率的平方根成正比，同时还与空化泡半径Rd、界面面积S＇等因素有关。采用文献实验数据验证文中关系式，与实验结果相吻合，能较好地描述相界面上逸出超声空化泡时液体中的传质行为。该关系式为超声波强化传质过程提供了理论依据。

A study of mass transfer induced by ultrasonic gas cavities evolving from phase interface

A mathematical relation is derived for mass transfer coefficient at phase interface evolving ultrasonic gas cavities based on the characteristic of fluid flow surrounding ultrasonic gas cavities and the penetration theory of mass transfer, combining with the principles of hydrokinetics. This shows that the ultrasonic power can accelerate mass transfer, and the mass transfer coefficient induced by ultrasonic gas cavities y is not only approximately proportion to the intensity of ultrasonic, but also to the square root of the diffusion coefficient and the volume rate of gas caused by ultrasonic gas cavities, and meanwhile related to the factors such as bubble size Rd, interface area S＇ and so on.. The mathematical relation is checked with literature date. It shows that the mathematical relation is consistent with the results of experiments, and can better describe the behavior of mass transfer induced by ultrasonic gas cavity in liquid. So, a theoretical basis of using ultrasonic to strengthen mass transfer process is provided by the mathematical relation.