十字微通道内大气液流速比下液相微分散特性

In microchannel two-phase flow, the size and distribution of dispersed phase determine the heat and mass transfer performance between phases. The effects of dispersion mode and flow rate on the liquid phase dispersion process in the cross microchannel under the condition of large gas-liquid velocity ratio were studied utilizing numerical simulation method in the present paper. It was found that the symmetric vertical-flow shear dispersion mode has better dispersion effect on the liquid phase than the symmetric cross-flow shear dispersion mode. The increase of flow rate reduces the liquid phase dispersion size and improves the two-phase flow disturbance, but weakens the difference between the dispersion effects of two dispersion modes on the liquid phase at the same time. The synergistic effect of interfacial tension, viscous force, inertial force and channel pressure existing in the gas-liquid two-phase flow system during the liquid phase dispersion process was analyzed in order to reveal the influence mechanism of dispersion mode and flow rate on the liquid phase dispersion. Besides, the liquid phase dispersion model under symmetrical vertical-flow shear dispersion mode was preliminarily established. The above study can provide a theoretical basis for strengthening the heat and mass transfer performance of gas-liquid two-phase flow in microchannels and the practical application of microchannels.