Abstract This paper focus on the effects of electrohydrodynamic (EHD) on bubble dynamic characteristics generated on a submerged capillary in ethanol under non-uniform electric field, using high-speed photography and with a particular interest in the effect of electrical Bond number (BoE) on the bubble behaviors. The obtained results ranges of BoE from zero to 5.52 and Weber number (We) from 0.0006 to 0.1365 show that the bubble formation process associated with three stages at the low electric field strengths, including the nucleation, stable growth and necking stages, while the stable growth stage is absent for the high field strengths. With the increase of both We and BoE, the bubble period and waiting times are shortened rapidly, while the frequency is accelerated remarkably. The bubble dynamic behavior, which is characterized by the bubble volume and curvature radius, depends primarily on the BoE, and the increase in the We slightly raises the bubble volume and curvature radius at the departure time. Furthermore, it is found that with the increasing of BoE, bubbles coalescence evidenced at high We is weakened and eventually disappeared. Nevertheless, this phenomenon has the tendency to subsequently reappear at the higher We and BoE.

中文翻译：

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EHD对非均匀电场下乙醇中周期性气泡形成和聚结的影响

摘要 本文重点研究电流体动力学 (EHD) 对非均匀电场下乙醇中浸没毛细管产生的气泡动力学特性的影响，使用高速摄影，并特别关注电键数 (BoE) 的影响。关于泡沫行为。获得的 BoE 范围从 0 到 5.52 和韦伯数 (We) 从 0.0006 到 0.1365 的结果表明，在低电场强度下气泡形成过程与三个阶段相关，包括成核、稳定生长和颈缩阶段，而稳定的高场强不存在生长阶段。随着 We 和 BoE 的增加，泡沫期和等待时间迅速缩短，而频率显着加快。气泡动态行为，以气泡体积和曲率半径为特征，主要取决于 BoE，而 We 的增加在离开时略微提高了气泡体积和曲率半径。此外，发现随着英国央行的增加，在高 We 证明的气泡聚结减弱并最终消失。尽管如此，这种现象有可能随后在较高的 We 和 BoE 中再次出现。