An Experimental Investigation of the Liquid Flow Induced by a Pulsed Electrical Discharge Plasma
An Experimental Investigation of the Liquid Flow Induced by a Pulsed Electrical Discharge Plasma
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脉冲放电等离子体引起的液体流动的实验研究
DOI：
10.1007/s11090-018-9905-3
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发表时间：
2018
影响因子：
3.6
通讯作者：
D. Bohl
中科院分区：
文献类型：
--
作者：
S. M. Thagard;G. R. Stratton;M. Vasilev;Patrick F Conlon;D. Bohl
在这项工作中，粒子图像测速仪已被用来可视化和量化等离子体诱导流场在液态水。实验是在棒-板等离子体反应器中进行的，该反应器具有悬浮在氩气中的液体的表面上方的细线电极和浸没在液体中的接地板。速度场已被量化为两种类型的解决方案：（1）不同的溶液电导率和放电频率的NaCl水溶液和（2）含有不同浓度的以下四种有机化合物的NaCl水溶液：罗丹明B染料，咖啡因，氟西汀，和全氟辛酸。结果表明，在纯净水和咖啡因水溶液中，液体通过气体分子与液体分子在自由表面处的相互作用而被“牵拉”沿着，因此液体流动的方向是气相流动的方向（即，远离排放位置）。然而，流动被逆转（即，朝向排放）用于具有强表面活性剂如全氟辛酸的那些溶液。逆转的幅度取决于化合物的初始浓度，并且对于某些化合物，随着时间的推移，逆转的流动模式减弱，然后恢复到正常的流动模式。为了确定这些流动逆转的最可能原因，开发了一个简单的速度场数值模型，以估计各种流动诱导机制的相对贡献。该模型表明，在表面活性剂的存在下，Marangoni应力是负责诱导液体中的流动。
In this work, particle image velocimetry has been used to visualize and quantify plasma-induced flow fields in liquid water. Experiments were performed in a rod-plane plasma reactor with a thin wire electrode suspended above the surface of the liquid in argon gas and a grounded plate immersed in the liquid. The velocity field has been quantified for two types of solutions: (1) aqueous NaCl solutions of varying solution conductivities and discharge frequencies and (2) aqueous NaCl solutions containing varying concentrations of the following four organic compounds: rhodamine B dye, caffeine, fluoxetine, and perfluorooctanoic acid. Results show that in neat water and aqueous caffeine solutions, the liquid is “pulled” along by the interaction of the gas molecules with the liquid molecules at the free surface and thus the direction of the liquid flow is in the direction of the gas phase flow (i.e., away from the discharge location). However, the flow was reversed (i.e., towards the discharge) for those solutions with strong surfactants such as perfluorooctanoic acid. The magnitude of the reversal depended on the initial concentration of the compound and for some compounds as time progressed the reversed flow pattern weakened and then reverted to a normal flow pattern. To determine the most likely cause of these flow reversals, a simple numerical model of the velocity field was developed to estimate relative contributions of various flow inducing mechanisms. The model indicates that in the presence of surfactants, Marangoni stresses are responsible for inducing the flow in the liquid.
DOI：
10.1088/0022-3727/38/6/017
发表时间：
2005-03
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
H. Kawamoto;S. Umezu
通讯作者：
H. Kawamoto;S. Umezu
DOI：
10.1088/1361-6463/50/1/014003
发表时间：
2017-01
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
S. Mededovic Thagard;G. R. Stratton;Fei Dai;C. Bellona;T. Holsen;D. Bohl;Eunsu Paek;E. Dickenson
通讯作者：
S. Mededovic Thagard;G. R. Stratton;Fei Dai;C. Bellona;T. Holsen;D. Bohl;Eunsu Paek;E. Dickenson