EHD behavior of nitrogen bubbles in DC electric fields
EHD behavior of nitrogen bubbles in DC electric fields
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DOI：
10.1016/j.expthermflusci.2007.03.006
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发表时间：
2007-10-01
影响因子：
3.2
通讯作者：
Chen, M.
中科院分区：
文献类型：
--
作者：
Chen, F.;Peng, Y.;Chen, M.
对注入变压器油的氮气气泡在不同直流电场下的变形进行了实验和理论研究。通过高速摄像机观察气泡变形。气泡的长轴沿平行于电场的方向伸长，且伸长率随着电场强度的增大而增大。电韦伯数 (We) 用于将电场强度和工作流体的介电常数与气泡相对纵横比 (AR(e)/ AR(o)) 相关联。实验结果表明，相对长径比随着We的增加而增加。根据实际气泡形状计算电应力，包括电致伸缩应力，以分析气泡伸长率。 (c) 2007 Elsevier Inc. 保留所有权利。
The deformation of nitrogen bubbles injected into transformer oil with various DC electric fields was studied experimentally and theoretically. The bubble deformation was visualized by a high speed camera. The major axis of the bubble was elongated along the direction parallel to the electric field, with the elongation increasing as the electric field strength was raised. The electrical Weber number (We) was used to correlate the electric field strength and the dielectric permittivity of the working fluid to the bubble relative aspect ratio (AR(e)/ AR(o)). The experimental results show that the relative aspect ratio increases with increasing We. The electric stresses were calculated on an actual bubble shape including the electrostriction stresses to analyze the bubble elongation. (c) 2007 Elsevier Inc. All rights reserved.