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在长52m、内径25.7mm的不锈钢管水平环道上,研究了液相粘度对水平管气液两相流流型的影响。试验中观测到5种流型:气团流、分层流、分层波浪流、段塞流、波浪流。在气、液折算速度相同的情况下,随液相粘度增大,气团流的长气泡增长,分层流和段塞流的液膜高度减小,段塞频率增大,波浪的平均液高和振幅增大,波浪的速度和频率减小。绘制了不同液相粘度下的气液两相流型图,当液相粘度不小于20mPa·s时,未观察到分层波浪流;随液相粘度增大,分层流的区域逐渐减小,气团流向段塞流的转换边界向小气速方向偏移,生成波浪流的边界向小液速大气速方向偏移,且更易形成段塞流。使用T-D模型进行对比验证,当液相粘度相对较大时,该模型不适用于本实验条件下的流型计算。
The effects of liquid viscosity on the flow pattern of gas-liquid two-phase flow in horizontal tubes were investigated on a horizontal ring of stainless steel tubes with a length of 52 m and an inner diameter of 25.7 mm. Five flow patterns were observed in the experiment: air mass flow, stratified flow, stratified wave flow, slug flow and wave flow. With the same velocity of gas and liquid, with the increase of the viscosity of the liquid phase, the long bubble of air-mass flow increases, the height of the liquid film in the stratified flow and the slug flow decreases, the slug frequency increases, the mean liquid height of the wave As the amplitude increases, the speed and frequency of the waves decrease. The gas-liquid two-phase flow patterns with different liquid viscosities were plotted. When the liquid viscosity was not less than 20 mPa · s, no stratified wave flow was observed. As the viscosity of the liquid phase increased, the stratified flow area gradually decreased , The boundary of the transition from the air mass flow to the slug flow is shifted toward the small air velocity and the boundary of the generated wave flow is shifted to the small liquid velocity in the direction of the atmospheric velocity and the slug flow is more easily formed. The T-D model is used for comparison and verification. When the liquid viscosity is relatively large, the model is not suitable for the flow pattern calculation under the experimental conditions.