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首页> 外文期刊>Journal of Heat Transfer >A Mechanistic Model of Liquid Film Movements in Pipe Elbows for Annular Flow
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A Mechanistic Model of Liquid Film Movements in Pipe Elbows for Annular Flow

机译：环形流动管弯头液膜运动机械模型

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摘要

A mechanistic model of film movements is developed based on the treatments on the annular flow field. The initial conditions at the inlet are determined by adopting a validated film thickness correlation of fully developed upward annular flow in vertical pipes. The overall pressure gradient is assumed to be uniform all along the axial distance within the elbow and the static pressure is also uniform on every cross section. The axial velocities of the liquid film and the core region are both uniform on the cross-sectional plane. The droplets are assumed to travel in straight lines normal to the inlet plane until colliding on and absorbed by the liquid film surface. The liquid film motion is divided into the axial and radial directions. Energy conservation law and Newton's second law are, respectively, used in the two directions. The film motion calculation is executed by using a discrete method with an explicit solution. The average film thickness and the circumferential thickness distribution on an arbitrary cross section can be obtained for the given flow conditions. The mechanistic model is verified by comparing the predicted circumferential distribution of film thickness with three series of experimental data from the literature. Parametric studies are also conducted to investigate the parameter effects and the range of application. The present work proves that the variation and distribution of film thickness within the elbows can be efficiently described by the mechanistic model.
机译：基于环形流场的处理开发了薄膜运动的机械模型。进样口处的初始条件是通过采用垂直管中完全显影的向上环形流动的验证的膜厚度相关来确定的。假设整个压力梯度沿着弯头内的轴向距离均匀，并且在每个横截面上也是均匀的静压。液膜和芯区域的轴向速度在横截面上均为均匀。假设液滴以正常到入口平面的直线行进，直到碰撞并被液体膜表面吸收。液体膜运动被分成轴向和径向。节能法和牛顿的第二法分别用于两个方向。通过使用具有显式解决方案的离散方法执行薄膜运动计算。可以获得在给定的流动条件下的任意横截面上的平均膜厚度和周向厚度分布。通过将膜厚度的预测的圆周分布与来自文献的三系列实验数据进行比较来验证机械模型。还进行了参数研究以研究参数效应和应用范围。本工作证明，可以通过机械模型有效地描述肘部内的膜厚度的变化和分布。

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