Flow distribution and phase split in micro-junctions are important for normal operations of micro-engineering devices. This work uses computational fluid dynamics method to study the phase distribution characteristics in a micro-junction. Numerical simulations of a micro-junction with different branch pipe dip angles were performed, and the phase split characteristics in the micro-junction was investigated. The flow distribution and phase volume fraction distribution were analyzed for annular inlet flows. The results show that, when the branch pipe dip angle is 90°, 120° and 150°, the liquid prefers to enter the side branch; when the branch pipe dip angle is 30°, the gas prefers to enter the side branch; when the branch pipe dip angle is 60°, the gas and liquid splits almost equally. Therefore, the structural improvement of the branch pipe can help to reduce the non-uniform phase distribution in the micro-junction.%微小三通管内的流量分配及相分配特性对微型工程设备的正常运行至关重要.为了研究微三通管流体分配器的相分配特性,采用了计算流体动力学方法,通过改变三通支管的倾角,对微小三通管道模型进行了数值模拟.分析研究了入口流型为环状流时,微小三通管道中的速度分布规律,气相和液相的体积分数分布规律.结果表明,当支管倾角为90°、120°、150°时,液相优先从侧支管中采出:支管倾角为30°时,气相优先从侧支管中采出:支管倾角为60°时可获得最佳的相均匀分配.通过微通道侧支管结构的改进可减少相分配的不均匀性.
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