倾斜下降管气液两相分层流截面含气率的计算与液层高度的预测

THE PREDICTION OF LIQUID LAYER HEIGHT AND CALCULATION OF VOID FRACTION ON GAS-LIQUID STRATIFIED FLOW IN INCLINED DOWNWARD TUBES

分层流是气液两相流中常见的流动型式，分层流中液层高度是计算的基本数据，由于界面波的存在，对液层的测量和预测都很困难．Ｖｌａｃｈｏｓ提出了预测气液两相分层流液层厚度的关系式，但这一关系式并不适用于倾斜下降管气液两相流．本文提出了计算倾斜下降管气液两相分层流截面含气率的理论模型，在这种模型下得到的截面含气率和实验结果符合良好．在大量实验的基础上，考虑了倾角、管径、气液各相折算速度的影响，根据实验数据提出了预测液层厚度的关系式。

Stratified flow is a common flow pattern in gas-liquid two-phase flow. The height of liquid layer in stratified flow is calculated basis data. The measurement and prediction of liquid layer height are very difficult due to the existence of interface wave. Vlachos has presented correlative equation predicting liquid layer height of gas-liquid two-phase stratified flow, but it is not fit for gas-liquid two-phase flow in inclined downward tubes. This paper puts forward theoretical model of calculating void fraction of inclined downward gas-liquid two-phase stratified flow. Void fraction calculated on the model agrees well with the experimental result. Based on amount of experiments, the effects of inclined angle, diameter of tube, superficial gas velocity and superficial liquid velocity are considered, this paper puts forward the correlative equation to predict the height of liquid layer.