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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Vertical two-phase flow regimes and pressure gradients: Effect of viscosity
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Vertical two-phase flow regimes and pressure gradients: Effect of viscosity

机译：垂直两相流态和压力梯度：粘度的影响

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摘要

The effect of liquid viscosity on the flow regimes and the corresponding pressure gradients along the vertical two-phase flow was investigated. Experiment was carried out in a vertical transparent tube of 0.019 m in diameter and 3 m in length and the pressure gradients were measured by a U-tube manometer. Water and a 50 vol.% glycerol solution were used as the working fluids whose kinematic viscosities were 0.85 x 10(-6) and 4.0 x 10(-6) m(2)/s, respectively. In our air-liquid annular two-phase flow, the liquid film of various thicknesses flowed adjacent to the wall and the gas phase flowed at the center of the tube. The superficial air velocity, j(air), was varied between 0.0021 and 58.7 m/s and the superficial liquid velocity, j(liquid), was varied between 0 and 0.1053 m/s. In the bubble, the slug and the slug churn flow regimes, the pressure gradients decreased with increasing Reynolds number. But in the annular and the mist flow regimes, pressure gradients increased with increasing Reynolds number. Finally, the experimentally measured pressure gradient values were compared and are in good agreement with the theoretical values. (c) 2006 Elsevier Inc. All rights reserved.
机译：研究了液体粘度对沿垂直两相流的流态和相应的压力梯度的影响。在直径为0.019 m，长度为3 m的垂直透明管中进行实验，并通过U型管压力计测量压力梯度。使用水和50％（体积）甘油溶液作为运动粘度分别为0.85 x 10（-6）和4.0 x 10（-6）m（2）/ s的工作流体。在我们的气液环形两相流中，各种厚度的液膜在壁附近流动，而气相在管的中心流动。表观空气速度j（air）在0.0021至58.7 m / s之间变化，表层液体速度j（liquid）在0至0.1053 m / s之间变化。在气泡，团状和团状流态中，压力梯度随雷诺数的增加而减小。但是在环形和雾状流态，压力梯度随雷诺数的增加而增加。最后，对实验测得的压力梯度值进行了比较，并与理论值相吻合。 （c）2006 Elsevier Inc.保留所有权利。

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