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考察了在气相中加入少量乙醇对水吸收CO2过程中液相界面对流的影响。采用粒子成像测速仪(PIV)测定了这一气体吸收过程中液体瞬时流场。通过对液体流场信息进行处理,得到了不同条件下速度和湍动能的数据及其分布;根据流场内速度和湍动能及其分布结构,定量分析了气相中加入乙醇对气液传质过程界面对流的影响,发现气相中乙醇的加入导致了局部Marangoni效应,很大程度上增大了界面附近的对流,为促进气液传质提供了依据。
The effect of adding a small amount of ethanol in the gas phase on convection of liquid phase during CO2 uptake by water was investigated. Particle imaging velocimetry (PIV) was used to measure the instantaneous flow field of liquid during the gas absorption process. The velocity and turbulent kinetic energy data and their distribution under different conditions were obtained by processing the information of liquid flow field. According to the velocity and turbulent kinetic energy in the flow field and its distribution structure, the quantitative analysis of the gas-liquid mass transfer process It is found that the addition of ethanol in the gas phase leads to the local Marangoni effect, which greatly increases the convection near the interface and provides a basis for promoting gas-liquid mass transfer.