Contrasting Behaviours of AC and DC Excited Plasmas in Contact with Liquid

LIU Jingjing (柳晶晶); HU Xiao (胡晓)

doi:10.1088/1009-0630/15/8/10

Plasma Science and Technology > 2013 > 15(8): 768-775. > DOI: 10.1088/1009-0630/15/8/10

LIU Jingjing (柳晶晶), HU Xiao (胡晓). Contrasting Behaviours of AC and DC Excited Plasmas in Contact with Liquid[J]. Plasma Science and Technology, 2013, 15(8): 768-775. DOI: 10.1088/1009-0630/15/8/10

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Contrasting Behaviours of AC and DC Excited Plasmas in Contact with Liquid

Department of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China

Funds: supported by National Natural Science Foundation of China (No. 51207027) and Scienti¯c Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China

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Received Date: July 15, 2012

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Abstract

Abstract

A comparative study of the needle-to-liquid plasma in the continuous mode with DC and AC excitations is detailed in this paper. All plasmas studied here are shown to be glow discharges. This study is based on measurements of several key parameters, including electrical energy, optical emission intensities of active species, rotational and vibrational temperatures, and temperatures of the needle and liquid electrodes. AC plasmas can produce 1.2~5 times higher excited state active species than DC plasmas under the same dissipated power. AC excited liquid plasmas have the highest energy utilization e±ciency among the three systems (AC excited plasmas, DC excited plasmas with water anode and DC excited plasmas with water cathode); most of the energy is used to produce useful species rather than to heat the electrodes and plasmas.
- electrical energy,
- active species,
- rotational temperature,
- vibrational temperature,
- energy use

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