Gas-liquid hydrodynamics with different liquid viscosities in a split-and-recombine microchannel
Gas-liquid hydrodynamics with different liquid viscosities in a split-and-recombine microchannel
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DOI：
10.1016/j.cep.2022.108988
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发表时间：
2022-05-25
影响因子：
4.3
通讯作者：
Ma, Youguang
中科院分区：
文献类型：
--
作者：
Chen, Weiyang;Wu, Bo;Ma, Youguang
分离重组技术在被动强化传质方面显示出巨大的潜力。然而，气液两相流在SAR微器件中很少遇到。在这项工作中，流态，空隙率，和压力降的气液流动在一个共同的SAR微通道设计与弯曲的发散收敛通道和矩形障碍物进行了实验研究。通过改变氮气/甘油水溶液的流速和甘油含量进行参数研究。用高速摄影机对四种流型，即完全破碎、部分破碎、异常破碎和环形流进行了观测。根据液相毛细管数（0.0022-1.016）和气液比（0.5-5），给出了流型图和预测流型转变的关联式。此外，修正的摩擦系数与毛细管和雷诺数的基础上的流动状态。总的来说，SAR微通道是一个有前途的候选人作为高效的气液接触器的传质速率，产品的选择性，和高粘度液体的能源效率。气泡长度和SAR单元数量的合理匹配是气泡完全破裂的必要条件。本研究可为气液两相流SAR微通道的设计、优化和调控提供参考。
Split-and-recombine (SAR) technology has shown great potential in the passive intensification of mass transfer. However, the gas-liquid flow is rarely encountered in the SAR microdevices. In this work, the flow regime, void fraction, and pressure drop of gas-liquid flow were experimentally studied in a common SAR microchannel designed with a curved divergence-convergence channel and rectangular obstacles. Parameter studies were conducted by varying the flow rates of nitrogen/glycerol aqueous solutions and glycerol contents. Four flow regimes, namely, total breakup, partial breakup, abnormal breakup, and annular flow are observed with a highspeed camera. The flow map and correlations to predict the regime transitions are presented based on the liquidphase Capillary number (0.0022-1.016) and gas/liquid rate (0.5-5). Furthermore, the modified frictional factor is correlated with Capillary and Reynolds numbers based on the flow regimes. Overall, the SAR microchannel is a promising candidate as the high-efficient gas-liquid contactor in terms of mass transfer rate, product selectivity, and energy efficiency for highly viscous liquids. A reasonable match of bubble length and the number of SAR units for the total breakup of bubbles is required. This study can contribute to the design, optimization, and regulation of the SAR microchannel for gas-liquid flows.