Electrohydrodynamic instabilities at interfaces subjected to alternating electric field
Electrohydrodynamic instabilities at interfaces subjected to alternating electric field
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DOI：
10.1063/1.3431043
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发表时间：
2010-06-01
影响因子：
4.6
通讯作者：
Thaokar, R. M.
中科院分区：
文献类型：
--
作者：
Gambhire, P.;Thaokar, R. M.
采用线性稳定性分析方法，研究了两种不混相介质（完美介质和漏电介质）在交变电场作用下的界面不稳定性。该系统稳定性的Floquet分析表明，频率对s（max）值、增长最快的不稳定性的增长率和激发不稳定性所需的最小场E-Taylor有显著影响。可见，与直流（dc）情况相比，交变磁场对系统的不稳定性起阻尼作用。此外，不稳定性的增长速度可以从受直流磁场影响的漏电介质在低频极限的增长速度调整到完美介质在高频极限的增长速度。我们还观察到，对于漏电介质-漏电介质界面，交流电场通过增加施加电压的频率，可以在零频率稳定的系统中引起不稳定。(C) 2010年美国物理研究所。(doi: 10.1063/1.3431043)
Instabilities at the interface of two immiscible fluids, either perfect or leaky dielectrics, subjected to alternating electric fields, is studied using a linear stability analysis in the limit of the electrode spacing being large compared to the wavelength of the perturbation. The Floquet analysis of the stability of this system indicates a significant effect of the frequency on the value of s(max), the growth rate of the fastest growing instabilities and E-Taylor, the minimum field required to excite an instability. It is seen that alternating fields act to damp the system instabilities compared to the direct current (dc) case. Moreover, the growth rate of the instabilities can be tuned from that of leaky dielectric fluids subjected to dc fields, in the low frequency limit, to that of perfect dielectrics in the high frequency limit. It is also observed that for a leaky dielectric-leaky dielectric interface, the alternating current (ac) fields can induce instabilities in a system which is stable at zero frequency, by increasing the frequency of the applied voltage. (C) 2010 American Institute of Physics. [doi:10.1063/1.3431043]