相界面上超声空化气泡聚并、滑移促进的传质

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,在充分研究相界面上气泡行为的基础上,根据界面上超声空化气泡生长过程的动力学行为,导出了相界面上超声空化气泡聚并和滑移促进的传质模型。在此基础上,建立了相界面上气泡滑移、聚并及脱离界面逸出这三种气泡行为共同促进的传质模型,该模型可用于描述超声空化界面等相界面上的传质行为,为超声波强化传质过程提供了理论依据。

Mass transfer induced by coalescence and slip of ultrasonic cavitation bubbles at phase interface

A mathematical model is derived for mass transfer coefficient induced by coalescence and slip of ultrasonic cavitation bubbles at phase interface based on the characteristic of fluid flow surrounding ultrasonic cavitation bubbles, the theory of fluid flow near the phase interface and the penetration theory of mass transfer combining with the principles of hydrokinetics, with reference to the result of the study of kinetic behaviour of ultrasonic cavitation bubbles in phase interface. Accordingly the model of mass transfer enhanced together by the slip, coalescence and detachment of gas bubbles on the phase interface is obtained, and the mathematical relation can describe the behavior of mass transfer induced by ultrasonic cavitation bubbles in liquid. So, a theoretical basis of using ultrasound to strengthen mass transfer process is provided by the mathematical relation.