Flow and mass transfer study of CO2 absorption by nanofluid in T-shaped microchannels
A gas-phase necked T-shaped microchannel was constructed,and the gas-liquid two-phase flow and mass transfer performance of silicon dioxide(SiO2)nanofluids in the process of CO2 absorption were studied.In the experimental range,the bubbly flow,beaded bubble flow,compact slug flow,and slug-annular flow were observed.With the increase of gas phase flow rate,the bubble formation frequency f and the specific surface area a of bubbly flow increase rapidly,f and a of beaded bubble flow change little,and f and a of compact slug flow gradually decrease.Moreover,the liquid-phase volumetric mass transfer coefficient showed an increasing trend with the rise of the flow rate of both continuous and dispersed phases and the nanoparticle concentration in the liquid.Compared to the equal width T-channel,the maximal specific surface area of the microchannel with the narrow gas-phase inlet increased by 29.6%.It is shown that the reduction effect of gas phase inlet can effectively increase the mass transfer area of gas-liquid two-phase flow,which is conducive to the improvement of gas-liquid mass transfer performance.
CO2 capturenanofluidsmicrochannelmass transferprocess enhancement
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