考虑盐度因素的水中气泡上升规律表征研究  

The Rising Bubble Motion Characteristics in Consideration of Seawater Salinity

作　　者：张志友[1] 金良安[1] 苑志江[1] 何升阳 

机构地区：[1]海军大连舰艇学院航海系,大连116018

出　　处：《科学技术与工程》2017年第15期334-338,共5页Science Technology and Engineering

基　　金：海军国防预研课题(401040301)资助

摘　　要：对考虑海水盐度因素的气泡上升规律进行研究,主要包括不同海水盐度对气泡脱离体积、瞬时稳态上升速度的影响。通过搭建气体水下排放试验台,使用常压空气和8种不同盐度的海水液体分别作为实验的气相和液相,将气泡划分为低雷诺数缓慢上浮及高雷诺数快速上浮两种运动状态;并分别进行实验。用高速摄影技术对气泡运动进行实验观察;并通过MATLAB编程对拍摄的图像进行分析处理。测定气泡脱离体积及瞬时稳态上浮速度。结果表示,气泡受海水密度、表面张力、黏性系数等物性条件共同作用,在低流速非射流工况下,随海水盐度的增加,气泡脱离体积减小;瞬时稳态速度属于低雷诺数上浮时,随盐度升高而增加明显;而属于高雷诺数上浮时,瞬时稳态上浮速度随盐度升高而缓慢降低。It studies the rising bubble motion characteristics in consideration of seawater salinity, including the rule of the various seawater salinities impacting on the volume of bubble departure and its instantaneous velocity. The underwater emissions of gas experimental platform is constructed. It uses normal pressure air and eight kinds of salinity seawater as the experiment’s gaseous phase and liquid phase. And the bubble motions are divided as slow motion in low Reynolds number and quick motion in high Reynolds number. Experiments with both bubble motions are all proceeded. The experiment uses high-speed photography technology to observe the bubble motion, and it an-alyses the filmed picture by the programming of MATLAB, so as to measure the volume of bubble departure and its instantaneous velocity. The result shows that the bubble motion is affected by the combined action of seawater-den-sity, surface tension, viscosity coefficient and other physical property. In the low velocity and non jet-flow condition, the volume of bubble departure decreases as the increasing of seawater salinity. The bubble instantaneous velocity accelerates obviously as the salinity increasing in low Reynolds number. However, the bubble instantaneous veloci-ty get slow down as the salinity increasing in high Reynolds number.

关 键 词：气泡形成 海水盐度 生成体积 上升速度 

分 类 号：U661.1[交通运输工程—船舶及航道工程]