圆管分层两相流问题的解析方法

Analytical Method for Pipe Stratified Two- phase Flow Problem

管道输运工程中经常遇到两相流问题,因此需要预测对流体施加的压力大小以指导运输。拟对圆直管道分层两相流-层流模型做研究,用解析方法计算出圆管任一截面处流体的速度分布,并验证两层流体交界面处的摩擦力与其平均速度差值呈近似线性关系的结论。以此为基础,可以通过计算截面速度分布得到流体与管壁的摩擦力,通过输运流体所需达到的速度得到分界面处摩擦力,最终反推出运输流体所需要施加的压力差大小。

Two-phase flow is usually encountered in pipe transport industry, hence the transport pressure needs to be forecas-ted for guiding the transport.This article studied a stratified two-phase flow in straight pipe model, calculated the velocity distribu-tion in pipe section, and then verified that approximately, a linear relation exist between the interlayer friction of the two fluids and their average velocity difference.Based on that, friction between the fluids and the pipe can be obtained by the velocity distribution in pipe section, and the interlayer friction can be obtained by the expected transport velocity, and the transport pressure can be in-ferred at last.