CO2 DISSOLUTION PROCESS AT GAS-LIQUID INTERFACE IN TWO-PHASE MICROCHANNEL FLOW

The CO2 dissolution process through gas-liquid interface in microchannel flow field was investigated by a simultaneous measurement of liquid velocity and pH via micro-PIV/ LIF techniques. In order to keep static gas-liquid interface for the optical measurement, a step-shaped PDMS microchannel was fabricated in order to balance the surface tension and fluid pressure. The CO2 concentration decreased with the increase of liquid velocity. The estimated convection and diffusion molar fluxes indicated that CO2 transport process in water is affected by convection.