Journal
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
Volume 177, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cep.2022.108988
Keywords
Split-and-recombine microchannel; Two-phase flow; Liquid viscosity; Flow regime; Void fraction; Pressure drop
Categories
Funding
- National Natural Science Founda-tion of China [22008220]
- Natural Science Foundation of Zhejiang Province [LQ21B060009]
- Key Research and Development Program of Zhejiang Province [2020C01010]
- Fundamental Research Funds of Zhejiang Sci-Tech University [2021Q014]
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The flow regime, void fraction, and pressure drop of gas-liquid flow in a SAR microchannel were experimentally studied. Four flow regimes were observed, and correlations to predict regime transitions were presented. The SAR microchannel shows potential as an efficient gas-liquid contactor for highly viscous liquids.
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.
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