Abstract: A level gas-liquid interface mass transfer analog device was established. By aid of Particle Image Velocimetry (PIV), liquid velocity distribution near mass transfer interface was observed and recorded in the process of CO2 desorption from with or without nano-particle ethanol solution. Interface turbulence initiated by Marangoni effect was observed during mass transfer taking place. The turbulent intensity and distance from gas-liquid interface in nanofluids was greater than that of ethanol solution. It could be explained that turbulence was intensified and transfer into deeper liquid bulk in nanofluid due to the microconvection of nano-particles, which lead to vortexes and fluids mixing and than promoting the gas-liquid mass transfer. Key words: nanofluid, mass transfer enhancement, Marangoni effect, microconvection

Key words: nanofluid, mass transfer enhancement, Marangoni effect, microconvection

摘要： 建立了一套水平气液界面传质模拟装置，利用粒子成像测速仪（PIV）对CO2从乙醇和乙醇纳米流体中解吸过程液相流场进行了观测和分析。传质发生时，在近界面处均观察到了由Marangoni效应造成的湍动。通过对平均速度的分析，发现在乙醇纳米流体中发生的湍动强度和湍动范围较乙醇溶液中大。纳米流体中的Marangoni效应加剧了纳米粒子的布朗运动，引发了纳米流体中的微对流，从而将界面处的湍动传递至液相主体中，导致液相主体的漩涡增多、流体混合加剧，促进了气液传质。

关键词: 纳米流体, 强化传质, Marangoni效应, 微对流