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气泡的生成、成长、脱离和上升等行为均是决定电场强化传热机理的主要过程,为获得电场作用下气泡生长的动态过程,研究了电场作用下冷态氮气泡的行为特性,利用高速摄像机拍摄了不同电场强度下的气泡生长试验图像,并对气泡脱离形态、周期和速度及加速度进行对比分析。试验结果表明,冷态氮气泡沿着场强方向拉长,呈圆柱体形状脱离壁面,气泡的脱离周期、速度与场强成正比,而加速度与场强成反比。
The formation, growth, detachment and ascent of bubbles are the main processes that determine the heat transfer enhancement mechanism of electric field. To obtain the dynamic process of bubble growth under electric field, the behavior of cold nitrogen bubbles under electric field is studied. The images of bubble growth under different electric field intensities were taken and the bubble detachment pattern, period, velocity and acceleration were comparatively analyzed. The experimental results show that the nitrogen bubbles in cold state lengthen along the direction of the field strength and form a cylindrical shape off the wall. The bubble stripping cycle is proportional to the field strength and the acceleration is inversely proportional to the field strength.