Abstract:

In two-phase annular flow, interfacial waves play a crucial role in mass, momentum and energy transfers between two phases. It is important to study characteristic parameters of the interfacial waves (wave velocity, wave frequency and amplitude). First, interfacial waves were classified and qualitatively described characteristics of every wave type. Then, interfacial wave velocity prediction model was developed on the basis of interfacial shear stress. With consideration of density increment of gas core caused by entrained droplets and effect of relative velocities between gas core and liquid film surface, a modified disturbance wave velocity prediction model was obtained for vertical two-phase annular flow. Interfacial wave velocity measurement sensor based on near infrared (NIR) absorption attenuation technology and cross-correlation principle was designed for high operating pressure in industrial process. Measurements of 154 different interfacial wave velocities under five system pressures of 0.2-0.9 MPa showed that the modified model had good prediction results with less than ±10% relative standard deviations and some extrapolation capability for different system pressure conditions.

Key words: vertical pipe, gas-liquid flow, optimization, absorption, interfacial wave, wave velocity, prediction

摘要：

在气液两相环状流中，界面波是两相间质量、动量和能量转移的重要载体，对其特性参数（波速、波频和波幅）的研究具有重要意义。首先根据气液两相流界面波分类，对其特征进行了定性描述。针对现有的界面剪切力推导了界面扰动波速度预测模型，考虑了气核中夹带液滴引起的密度增量及气核与液膜表面相对速度的影响，得到了改进的垂直管环状流扰动波速预测模型。针对工业现场工况压力较高现状，设计了基于近红外吸收衰减技术和互相关原理的界面波波速测量传感器，在五种压力（0.2～0.9 MPa） 154个界面波波动速度条件下进行了实验。结果表明，改进后模型预测效果良好，相对误差在±10%左右，在不同系统压力条件下具有一定外推性。

关键词: 垂直管, 气液两相流, 优化, 吸收, 界面波, 波动速度, 预测