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Study on Gas-Liquid Two-Phase Flow in a Capillary Tube under Microgravity

微重力下毛细管内气液两相流研究

基本信息

批准号：
10650178
负责人：
OUSAKA Akiharu
金额：
$ 2.11万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650178/
关键词：
Multiphase Flow Microgravity Oil-Water Mixture Fluids Horizontal Capillary Tube Flow Pattern Map Pressure Drop Oil Plug Behavior Multiresolution Analysis 混合部垂直細管流細管水・油混合流体流動様式ホールドアッププラグ流

项目摘要

Experimental investigation was made on the flow pattern, the hold-up of oil, the frictional pressure drop and the behavior of oil bubble of a nearly-equal-density oil-water two-phase flow in a horizontal capillary tube to make clear the effects of tube diameter, viscosity and mixing method on them. The tube diameters examined are 5 mm and 2 mm, and the viscosities are 48.3 mPas and 0.82 mPas. The results are summarized as follows.1. Flow pattern map was influenced by capillary tube diameter, viscosity and mixing method. The standard deviation, skewness and kurtosis of the probability density function of time-varying hold-up of oil depended on flow configuration.2. Chisholm's correlation applicable for viscous-viscous flow in the gas-liquid two-phase flow agrees with the present experimental data. Consequently we can calculate the fictional pressure drop of a nearly equal density oil-water two-phase flow in a horizontal capillary tube.3. The behavior of oil plug, such as oil plug length … More , velocity and passing frequency, in equal density oil-water flow was fundamentally different from that in air-water two-phase flow in a capillary tube.(1) The velocity of oil bubble increases with the total volumetric flux, the correlation for non-slip agrees with the data in low total volumetric flux region. The value of distribution parameter in a nearly equal density oil-water two-phase flow changes gradually from 1.0 to 1.2 with increasing the total volumetric flux.(2) The influence of four kinds of nozzle hole size on the inner tube in the mixing chamber and that of two types of mixing method were investigated. As a result, it was clarified that the nozzle hole size effected on the oil plug length but not the oil bubble velocity.(3) From the multi-resolution analysis about the signals of hold-up and pressure drop, it was clarified that there was a oscillation between the nose of oil plug and the tail which showed the interfacial small waves between the nose of oil plug and the tail.(4) The pipe inclination influenced on the two-phase flow multiplier of frictional pressure drop, but not affected very much on the hold-up. The two-phase flow multiplier of frictional pressure drop in vertical upflow was smaller than that in horizontal flow. Less

对水平毛细管内近等密度油水两相流的流型、持油率、摩阻压降和油泡行为进行了实验研究，以明确管径、粘度和混合方式对它们的影响。测试的管直径为5 mm和2 mm，粘度为48.3mPas和0.82mPas。研究结果如下：1.流型图受毛细管直径、粘度和混合方式的影响。时变持液率概率密度函数的标准差、偏度和峰度与流型有关.适用于气液两相流中粘-粘流动的奇泽姆关联式与实验数据吻合较好。从而可以计算出水平毛细管内近似等密度油水两相流的虚拟压降.油塞的行为，如油塞长度 ...更多信息等密度油水两相流中的流速和通过频率与毛细管中的气水两相流有着根本的不同。(1)油泡速度随总体积流量的增大而增大，在低总体积流量区，无滑移关联式与实验数据吻合较好。在近似等密度油水两相流中，随着总体积流量的增加，分布参数的值从1.0逐渐变化到1.2。(2)研究了四种喷孔尺寸和两种混合方式对混合室内管的影响。结果表明，喷孔尺寸对油塞长度有影响，但对油泡速度无影响。(3)通过对持液率和压降信号的多分辨率分析，明确了油塞头部与尾部之间存在振荡，表现为油塞头部与尾部之间的界面小波动。(4)管道倾角对两相流摩擦压降系数有影响，但对持液率影响不大。垂直上升流的两相流摩擦压降乘数小于水平流。少