竖直环形狭缝通道内环状流的预测模型

A Prediction Model for Annular Flow in Vertical Narrow Annular Gap

对竖直环形狭缝通道内环状流流动沸腾传热理论模型进行了分析,以液膜质量、动量和能量守恒方程为基础,结合汽芯动量方程建立了竖直环形狭缝通道内环状流的数学物理模型。对该模型进行数值求解,得出了液膜厚度、液膜内的速度分布和温度分布、内-外管的换热系数以及通道内压降值,并与实验值进行了比较。

This paper analyses the theoretical model for annular flow boiling heat transfer in vertical narrow annular channel and develops a mathematical model on the base of the mass, momentum and energy conversation equations of liquid film, as well the momentum equation of vapor core. Liquid film thickness, radial velocity and temperature distribution in liquid film, heat transfer coefficient of inner and outer walls and axial pressure gradient can be obtained by numerically solving the equations. The comparison between predicted results and experimental data shows that they meet each other well. This confirms the rationality of the prediction model for annular flow in narrow annular channel.