关键词:

投影, 界面湍动, 传质, Marangoni对流, Rayleigh-Bénard对流

Abstract:

In gas-liquid mass transfer processes，interfacial turbulence may occur due to the surface tension gradient and the density gradient produced by mass transfer near the interface.The interfacial turbulence can enhance the mass transfer since it intensifies the movement of interfacial fluid.By means of the shadowgraph optical method，the interfacial turbulence patterns vertical to the interface were observed directly in the volatilization process of binary systems.The images of the amplified interfacial turbulence showed the variation of concentration and the fluid movement under the interface.Two patterns of interfacial turbulence were observed in the experiments：plume and vortex.With the plume，the interfacial fluid moved slowly and penetrated the liquid deeply.With the vortex，the interfacial turbulence occurred in the vicinity of the liquid interface and the fluid moves quite fast.A qualitative analysis was carried out based on the mechanism of Rayleigh-Bénard convection induced by density gradient and Marangoni convection induced by surface tension gradient.

Key words:

投影, 界面湍动, 传质, Marangoni对流, Rayleigh-Bénard对流