关键词: 净泄漏流, 气液相流量, 液相物性, 气泡长度, 预测

Abstract: Microfluidic platforms have promising applications in gas-liquid mass transfer, heat transfer and chemical reaction, due to its great specific surface area, precise control of residence time, and stability of the transport process. The Taylor flow for six different gas-liquid systems with different surface tension and viscosity were systematically investigated in rectangular cross-section serpentine microchannels, aiming at dynamic behavior of bubbles and liquid slugs. Based on the geometric model of bubble cross-sectional shape, quantitative equation of the net leakage flow was successfully got. It is simultaneously found that the controllability of the serpentine microchannel on the leakage flow is better than that of the straight microchannel in a larger operating range. And the effects of different gas-liquid flow rates, liquid physical properties (surface tension and viscosity) and bubble length on the net leakage flow of the main channel for the serpentine microchannel were respectively analyzed in detail.

Key words: net leakage flow, gas and liquid flow, liquid physical properties, bubble length, prediction