A STUDY ON FLOW BEHAVIOR OF GAS-LIQUID TWO-PHASE SLUG FLOW IN MICROCHANNEL

摘要

Flow behavior of two-phase gas-liquid slug flow in microchannel is studied. The experimental observations were carried out for the single liquid slug suspended in the glass tube of small diameters. The results showed that as the liquid slug length increases, the receding contact angle largely decreases whereas the advancing contact angle slightly increase. The measured contact angles of receding and advancing interfaces well explained the force balance between surface tension force and gravitational force of liquid slug. Numerical analyses were carried out for predicting the interfacial structure of the receding and advancing interfaces with satisfactory agreement with the experimental observation. Based on the analyses of single slug behavior, flow behavior in two-phase natural circulation in microchannel was studied experimentally. Using the experimental loop of microchannel, the characteristics of the natural circulation in vertical upward two-phase flow were studied. The results showed that the flow rate and slug velocity decreases as the increases of the number of slugs in the channel (corresponding to liquid fraction) and channel diameter. Based on the experimental data of pressure drop in two-phase flow and simple model of interfacial momentum transfer, pressure loss due to the interface of each slug was evaluated It was shown that interfacial pressure loss is almost same independent of number of liquid slugs, slug lenglh and slug velocity. Some discussions were made on the application of gas-liquid slug flow in microchannel on efficient fluid transport