电场作用下冷气泡行为试验研究

Experimental Study on the Behavior of Cold Air Bubbles in Electric Field

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 behavior of bubble growth,departure and rising is the main process to determine the electric heat transfer enhancement mechanism.In order to acquire the dynamic process of bubble growth,the behavior characteristics of cold nitrogen gas bubble under the electric field intensity is studied.And the high-speed video camera is applied to shoot the bubble growth image under different electric field intensity.Then the shape,cycle and velocity of bubble are analyzed when the bubble is broken away.The test results show that the cold nitrogen gas bubble is elongated along the direction of electric field intensity and departs the copper surface on the shaping of cylinder;the cycle and velocity of bubble are proportional to the electric field intensity,but the acceleration is inversely proportional to the field intensity.