起伏振动状态下水平管内气液两相流研究

A study on gas-liquid two-phase flow in a horizontal tube under heaving motion

通过将振动装置与两相流实验回路结合的方法,对起伏振动状态下水平管内气液两相流问题进行了实验研究。同时基于FLUENT平台,结合动网格模型及UDF编程手段,通过数值模拟的方法,进一步扩展了研究内容:重点考察了振动工况及流体性质对压降和流型转换的影响。研究结果表明:振动工况下气液两相流动形式不同于稳态工况,主要流型有珠状流、泡弹流、沸腾波状流、波状流以及环状流。振动影响管内压降,但当Re数大于5 600时,无论是振动频率还是振动幅度对压降均没有很大影响。与稳态工况类似,黏度几乎不影响流型转换界限,流体处于高黏度状态时,振动工况对于流型转化及压降的影响减弱。振动频率和振动幅度的增大均使得流型转换界限呈现向外扩张的趋势,且与振动幅度相比,振动频率的改变对流型转换影响更大。

According to the method of combining vibration apparatus with two-phase flow experiment loop,an experimental study on gas-liquid two-phase flow in a horizontal tube under heaving motion was conducted.At the same time,based on using the dynamic mesh technique,more about gas-liquid two-phase was simulated by the platform of FLUENT using UDF.The influences of vibration condition and fluid properties on mean pressure drop and flow regime transition line were analyzed.The results show that flow patterns of gas-liquid two-phase flow under heaving motion are different from those under steady condition,and main flow patterns are found as beaded flow,slug flow,shell flow,wave flow,and annular flow.Heaving motion has a great effect on mean pressure drop of fluid flow,but when flow rates or liquid viscosity of fluid are higher,it has a smaller influence on mean pressure drop and flow pattern transition lines.Similar to steady condition,there is little effect of viscosity on the flow pattern transition line.Flow regime shows that flow pattern zones were expanded with vibrate frequency and amplitude.Comparing to vibrate amplitude,vibrate frequency had a greater impact on the flow pattern transition line.