【摘要】 为了研究小通道气液两相流动特性,建立了T型小通道模型,采用VOF方法进行数值模拟。通过与实验流型的对比,验证了该模拟的可靠性,并对该通道所观测到的泡状流、弹状流和环状流的流型、压力和压降以及间歇流的气泡生成和气泡长度进行了数值分析。结果表明:气液流速比对流型的转变有很大影响;对于间歇流来说,气相速度一定,液体速度增大,气泡长度变小;间歇流气相的压力大于周围液相的压力;环状流的气液界面有较大波动时,会形成很大的压降。更多还原

【Abstract】 To study gas-liquid two-phase flow characteristics in the small channel,a T-junction mini channel was established,using VOF method for numerical simulation. The numerical method was validated by comparing with the experimental flow patterns. The flow pattern,pressure and pressure drop of bubbly,slug and annular flow,and bubble formation and bubble length of intermittent flow observed in this channel were analyzed numerically. The results show that the gas-liquid velocity ratio has great influence on flow transitions. For intermittent flow,the superficial velocity of gas phase is constant and the liquid superficial velocity increases,then bubble length decreases. The pressure of gas phase is higher than that of the surrounding liquid phase for intermittent flow. When the gas-liquid interface of annular flow fluctuates violently,great pressure drop will be formed.更多还原