毫米通道内氯苯-水非均相体系混合效果研究

以氯苯-水体系为对象,研究了毫米通道内液液非均相流体在不同流速下的流动形态及其混合传质效果。通过对子弹流型、子弹单滴混合流型、三相并行流型的观察分析,以流动雷诺数、毛细数、韦伯数为评价参数,讨论了流体流动表面力与流型形成的关系。以混合传质前后水相中醋酸浓度的变化为分析依据,探究了流体流型、流速对液液非均相体系传质效率与总体积传质系数的影响。结果表明:界面张力是子弹流型、子弹单滴混合流型形成的主导控制力,流动惯性力则促进三相并流的产生;随着流速的增加和流型的转变,扩大了二相传质界面积,提高了混合过程的总体积传质系数和传质效率。

Mass transfer effect of chlorobenzene-water nonhomogeneous system in milli-channel

The flow patterns and mass transfer of liquid-liquid nonhomogeneous fluids under different flow rates in milli-channel were studied with chlorobenzene-water two-phase solution as object.Through the observation and analysis of different flow patterns including slug flow,slug-single drop mixed flow and three-phase parallel flow,the relationship between flow patterns and surface forces was developed by correlation analysis of Reynolds number,Capillary number and Weber number.According to the variation of the concentration of acetic acid before and after mass transfer in water phase,the influence of flow patterns and velocity on mass transfer efficiency and overall volumetric mass transfer coefficient was further deduced.The result shows that interfacial tension acts as the dominant force for formation of slug flow,slug-single drop mixed flow,while the inertial forces facilitate the formation of three-phase parallel flow.Flow patterns change with the raise of flow velocity,which results in an increasing in the two-phase interface area,mass transfer efficiency and overall volumetric mass transfer coefficient.