Interfacial Waves in Accelerated Gas-Liquid Two-Phase Flows

加速气液两相流中的界面波

• 批准号: 02650157
• 负责人: KAJI Masuo
• 金额: $ 0.96万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650157/
• 关键词: Gas-Liquid Two-Phase Flow; Evaporator Tube; Accelerated Flow; Horizontal Rectangular Channel; Flow Pattern; Two-dimensional Wave; Disturbance Wave; Electrical Conductance Method; じょう乱波; 加速

An accelerated gas-liquid two-phase flow in an evaporator tube was simulated by an air-water system experiment. Characteristics of interfacial waves in a horizontal rectangular channel were measured by the electrical conductance method. Mechanisms of generation, growth and decay of the disturbance wave were analized considering the power spectrum density and the cross correlation function of variations of the liquid film thickness.(1) Flow pattern maps were constructed from the visual observation in the accelerated channels. At lower gas flow rate, the channel height affected the flow pattern transition. Flow pattern transitions were predicted fairly well by using the superficial gas and liquid velocities, compared to the results using liquid mass flow rate per unit channel width as a parameter.(2) Characteristics of interfacial waves of accelerated two-phase flow in a horizontal rectangular channel were clarified. Under acceleration two-dimensional waves were deformed and the disturbance waves appeared. Mutual relationships between amplitudes and frequenices of those waves were analized.(3) The simulation experiment by an air-water system was considered to be valid for the examination of interfacial wave characteristics in the evaporator tube.

通过空气-水系统实验，模拟了蒸发管内加速气液两相流动。用电导法测量了水平矩形通道中界面波的特性。从液膜厚度变化的功率谱密度和互相关函数出发，分析了扰动波的产生、增长和衰减机理。(1)根据加速通道中的目视观察构建流型图。在较低的气体流量下，通道高度影响流型转变。流型转变预测相当不错，通过使用表观气体和液体的速度相比，使用单位通道宽度的液体质量流率作为参数的结果。(2)阐明了水平矩形通道内加速两相流界面波的特性。在加速度作用下，二维波发生变形，出现扰动波。分析了各波振幅与频率之间的相互关系。(3)空气-水系统的模拟实验被认为是有效的，在蒸发器管内的界面波特性的检查。