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为进一步探索电场强化沸腾换热的机理,利用高速摄像机研究绝热条件下注入到静止变压器油中的氮气泡在电场作用下的行为,获得了在不同电场作用下气泡形态成长的实验图像,并分析了电场作用下气泡的长径比、脱离体积和脱离周期随电场的变化关系。实验研究表明:随着电场强度的增大,气泡的长径比变大,脱离体积变小,脱离周期变短。电场中气泡行为的改变主要取决于电场强度和电极距离。外电场作用促进了注入气泡从小孔的脱离。
In order to further explore the mechanism of electric field to enhance boiling heat transfer, a high-speed camera was used to study the behavior of nitrogen bubbles injected into static transformer oil under adiabatic conditions under electric field. Experimental images of bubble growth under different electric fields were obtained and analyzed Under the action of electric field, the aspect ratio, detachment volume and detachment period of the bubbles vary with the electric field. Experimental results show that: with the increase of electric field, the aspect ratio of the bubble becomes larger, the detachment volume becomes smaller and the detachment period becomes shorter. The behavior of the bubbles in the electric field mainly depends on the electric field strength and the electrode distance. The external electric field promotes the detachment of the injected bubbles from the pinholes.