Flow distribution and mass transfer in a parallel microchannel contactor integrated with constructal distributors
Flow distribution and mass transfer in a parallel microchannel contactor integrated with constructal distributors
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DOI：
10.1002/aic.11991
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发表时间：
2009-08
期刊：
影响因子：
3.7
通讯作者：
Jun Yue;R. Boichot;L. Luo;Yves Gonthier;Guangwen Chen;Q. Yuan
中科院分区：
文献类型：
--
作者：
Jun Yue;R. Boichot;L. Luo;Yves Gonthier;Guangwen Chen;Q. Yuan
通过数值和实验研究了二氧化碳-水流过集成有两个结构分配器的平行微通道接触器时的流量分布和传质特性。每个分配器都包含一个二分树结构，为 16 个水力直径为 667 lm 的微通道供电。研究发现，结构分配器可以确保高气体流速下几乎均匀的气液分布，其中理想的流动模式是段塞环流。然而，在理想流型为段塞流的小气体流速下，发生显着的流量分布不均主要是由于每个分配器内部缺乏大的压力屏障，这表明平行微通道中的动态压力波动极大地干扰了其中原本良好的流量分布。进一步表明，由于结构分配器的集成，本发明的并联微通道接触器可以在相对较宽的操作范围内实现先前在单个微通道中实现的所需传质性能。 VVC 2009 美国化学工程师学会 AIChE J, 56: 298–317, 2010 关键词：微通道、向上编号、流量分布、气液传质、结构理论
Flow distribution and mass transfer characteristics during CO2-water flow through a parallel microchannel contactor integrated with two constructal distributors have been investigated numerically and experimentally. Each distributor comprises a dichotomic tree structure that feeds 16 microchannels with hydraulic diameters of 667 lm. It was found that constructal distributors could ensure a nearly uniform gas–liquid distribution at high gas flow rates where the ideal flow pattern was slug-annular flow. Nevertheless, at small gas flow rates where the ideal flow pattern was slug flow, a significant flow maldistribution occurred primarily due to the lack of large pressure barrier inside each distributor, indicating that dynamic pressure fluctuation in parallel microchannels greatly disturbed an otherwise good flow distribution therein. It was further shown that the present parallel microchannel contactor could realize the desired mass transfer performance previously achieved in one single microchannel under relatively wide operational ranges due to the integration of constructal distributors. VVC 2009 American Institute of Chemical Engineers AIChE J, 56: 298–317, 2010 Keywords: microchannel, numbering-up, flow distribution, gas–liquid mass transfer, constructal theory