微小三通管弹状流与环状流相分配机理对比研究

Comparison the Mechanismof Phase Split of Slug and Annular Flow in Micro-Junction

采用计算流体动力学方法,通过改变支管倾角,对微小三通管道模型进行了数值模拟,研究了入口流型为弹状流和环状流时,微小三通管道的相分配特性,分析了管道中气相和液相的体积分数分布规律。结果表明,微通道内的相分离特性受上游两相流流型影响。弹状流气相优先在支管中采出,而环状流的液相优先在支管中采出。对比研究微小三通管弹状流与环状流相分配机理,入口流型为环状流时,支管倾角为60°的管内流动,经过三通管道,延续环状流稳定方面有较大优势,可获得最佳的相均匀分配;入口流型为弹状流时,当支管倾角减小为20°和30°时,两者质量分离效率相差小于5%,质量分离效率最低,可获得最佳的相均匀分配。

Numerical simulation for micro-junction of different branch pipe dip angle was carried out by using the CFD method. The phase split characteristic of slug and annular flow in micro-junction was investigated and the phase volume fraction distribution was analyzed. The results show that Phase separation characteristics of micro channel is influenced by two phase flow upstream flow pattern. Slug priority in the branch current in phase extraction,whereas the annular flow of liquid produced in the branch pipe. Comparison mechanism of Phase Split of Slug and annular Flow in Micro-Junction. when the type inlet flow to annular flow,when the branch pipe dip angle is 60°,after a three-way pipes,continuation of annular flow stability has great advantages,the phase split characteristic is uniformity. when the type inlet flow to slug flow,For the branch pipe dip angle of 20°and 30°,the quality of separation efficiency difference is less than 5%,causing a lowest quality separation efficiency.