NDLI: Thresholds for microbubble and microplasma generation in liquid

Content Provider	IEEE Xplore Digital Library
Author	Peng Xiao Staack, David
Copyright Year	2014
Description	Author affiliation: Mechanical Engineering Department, Texas A&M University, College Station, 77845, US (Peng Xiao; Staack, David)
Abstract	Thresholds for low density regions (microbubbles) and microplasma light emissions generation in liquid are studied. With nanosecond microdischarges at different applied peak voltages with the different sizes of microelectrode tip, the low density regions (microbubbles) are captured by a high speed ICCD camera and the microplasmas light emissions are detected by both the ICCD camera and a Photomultiplier Tube (PMT). Deionized water with NaCl was employed as the experimental liquid. Different concentrations of NaCl present different conductivities. With the high conductivity (17600µS/cm), the mciroplasmas light emissions are always accompanied with microbubbles generation at various applied peak voltages (−3kV to −12kV). For a low conductivity (1990µS/cm), there were thresholds of applied peak voltage for different phenomenon of the microplasmas and the microbubbles. With the applied peak voltage in the range of 0kV to −4kV, neither the microbubble formation nor the detectable microplasma slight emission was observed by ICCD and PMT. With the applied peak voltage in the range of −4kV to −6kV, the visible microbubbles was able to be observed, but no microplasma light emission could be detected by both ICCD and PMT. With the applied voltage larger than −6kV in magnitude, both of the visible microbubbles and microplasma light emission can be observed. The thresholds of applied peak voltages are determined from observations. With different applied voltage and same conductivity, the energy inputs are proportional to the applied voltages. Experimental results presented by ICCD and PMT suggest that there exist a correlation of the generation of microplasmas and microbubbles to the applied peak voltages and energy inputs. Different scenarios for the appearances of both of microbubbles and microplasmas, only microbubbles without microplasmas or neither of microbubbles and microplasmas assist our investigation of the mechanism of microplasmas in liquid.
Starting Page	1
Ending Page	6
File Size	1595136
Page Count	6
File Format	PDF
ISBN	9781479927111
e-ISBN	9781479927135
DOI	10.1109/PLASMA.2014.7012711
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Discharges (electric) Liquids Plasmas Cameras Microelectrodes Conductivity
Content Type	Text
Resource Type	Article

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