A study on liquid slug behavior of gas-liquid two-phase flow in capillary tubes

摘要

Gas-liquid two-phase flow in micro-channel was investigated. In micro-channel, flow regime is usually slug flow. In the first step, single liquid slug behavior was investigated in detail. Liquid slugs are suspended in micro-channel due to the difference of contact angles of advancing and receding interfaces. The effects of liquid slug length, tube diameter on the contact angles were investigated and compared with numerical analyses. Based on the analyses of single slug behavior, two-phase natural circulation in micro-channel was analyzed. The effects of the slug length and void fraction on the flow rate of the natural circulation were also analyzed. Pressure loss due to the interface of each slug was evaluated and it was shown that interfacial pressure loss is almost same, so that it is independent of slug length and slug velocity.