Gas–liquid two-phase flow splitting at microchannel junctions with different branch angles
Gas–liquid two-phase flow splitting at microchannel junctions with different branch angles
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DOI：
10.1016/j.ces.2013.10.013
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发表时间：
2013-12
影响因子：
4.7
通讯作者：
Jin-Fang Chen;Shuangfeng Wang;H. Ke;S. Cai;Zhao Ying
中科院分区：
文献类型：
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作者：
Jin-Fang Chen;Shuangfeng Wang;H. Ke;S. Cai;Zhao Ying
在绝热条件下，对0.5×0.5 mm 2方形截面微通道交界处的相分离进行了实验研究。制造了具有从30°到150°变化的五种不同分支角度的微通道接头。采用了两种不同的方法来控制从运行/分支的气/液分离，适用于采集包括段塞流、段塞-环状流和环状流在内的各种流型的分离数据。气相（氮气）的入口表观速度为0.8 ~ 21.3 m/s，液相（纯水）的入口表观速度为0.019 ~ 0.356 m/s。利用高速记录技术研究了两相流在微通道交界处的分离过程。数据分析表明，当入口流型由弹状流转变为环状流时，相分裂曲线并不简单地呈现过渡特征。此外，对于各种入口流型，从分支带走的液体不随分支角度的增加而减少。最后，通过将现有数据与小尺度和大尺度研究的数据进行比较，发现在微通道连接处，更多的液体从分支中被带走。
In the present work, the phase split occurring at microchannel junctions with the square cross-section of 0.5×0.5 mm2was investigated experimentally under adiabatic condition. Microchannel junctions with five different branch angles varying from 30° to 150° were manufactured. Two different methods of controlling gas/liquid division from the run/the branch were employed, suitable for acquiring splitting data for a wide range of flow patterns covering slug flow, slug–annular flow and annular flow. The inlet superficial velocities varied from 0.8 to 21.3 m/s for gas phase (nitrogen), and from 0.019 to 0.356 m/s for liquid phase (pure water). The high speed recording technique was utilized to elucidate the fluid dynamics of two-phase flow splitting at microchannel junctions. Data analysis revealed that the phase splitting curves did not simply take on a transitional characteristic when the inlet flow pattern changed from slug flow to annular flow. Furthermore, the liquid taken off from the branch did not decrease with increasing branch angle for all kinds of inlet flow patterns. Finally, by comparing the present data with those of mini- and macro-scale research, it was found that more liquid was taken off from the branch at microchannel junctions.