Influence of liquid temperature on the characteristics of an atmospheric dc glow discharge using a liquid electrode with a miniature helium flow
Influence of liquid temperature on the characteristics of an atmospheric dc glow discharge using a liquid electrode with a miniature helium flow
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DOI：
10.1088/0963-0252/20/3/034013
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发表时间：
2011-06
影响因子：
3.8
通讯作者：
N. Shirai;Kosuke Ichinose;S. Uchida;F. Tochikubo
中科院分区：
文献类型：
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作者：
N. Shirai;Kosuke Ichinose;S. Uchida;F. Tochikubo
利用液体阴极和轴向微型氦流在喷嘴阳极和电解质阴极（NaCl溶液）之间稳定地产生了大气直流辉光放电。在低电流下，观察到直流辉光放电的典型结构，即负辉光、法拉第暗空间和正柱。随着放电电流的增大，可见的负辉光变弱，取而代之的是强烈的黄光发射，这被认为是由于辉光放电中的离子轰击引起的局部加热使钠原子从电解质表面蒸发而产生的。为了研究液体电极温度对放电特性的影响，我们使用注射式冷却器或加热器控制电解质阴极温度。当电解液阴极冷却时，钠的发射强度降低，而当电解液阴极加热时，钠的发射强度增加。当施加脉冲调制直流电压时，钠的发射相对于放电开始有延迟出现，而氮分子谱线在发射光谱中出现并立即达到峰值强度。液体阴极的温度是控制放电过程中等离子体-液体相互作用的重要因素，也是解决电解液阴极放电详细机理的重要因素。
An atmospheric dc glow discharge using a liquid cathode and an axial miniature helium flow was generated stably between a nozzle anode and an electrolyte cathode (NaCl solution) in ambient air. Under low-current operation, the typical structure of dc glow discharges, i.e. a negative glow, a Faraday dark space and positive column, was observed. With increasing discharge current, the visible negative glow became weak and was replaced by an intense yellow-light emission, which was considered to originate from sodium atoms vaporized from the electrolyte surface by local heating due to ion bombardment from the glow discharge. To examine the effect of the liquid electrode temperature on the discharge characteristics, we controlled the electrolyte cathode temperature using an injection-type cooler or heater. The intensity of the sodium emission decreased when the electrolyte cathode was cooled, while it increased when the electrolyte cathode was heated. When a pulse-modulated dc voltage was applied, the sodium emission appeared with a delay relative to the inception of discharge, while nitrogen molecular lines appeared in the emission spectra and reached their peak intensities immediately. The temperature of the liquid cathode is an important factor in controlling the plasma–liquid interaction from the discharge and in resolving the detailed mechanism of the electrolyte cathode discharge.