Effects of surrounding gas on plasma-induced downward liquid flow

Toshiyuki Kawasaki; Keisuke Nishida; Giichiro Uchida; Fumiaki Mitsugi; Kosuke Takenaka; Kazunori Koga; Yuichi Setsuhara; Masaharu Shiratani

doi:10.35848/1347-4065/ab71dc

Effects of surrounding gas on plasma-induced downward liquid flow

Toshiyuki Kawasaki, Keisuke Nishida, Giichiro Uchida, Fumiaki Mitsugi, Kosuke Takenaka, Kazunori Koga, Yuichi Setsuhara, Masaharu Shiratani

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Abstract

Understanding the mechanisms behind plasma-induced liquid flow is important for the transport of reactive species in liquid. In this study, we studied the effects of the surrounding gas compositions of a plasma-jet on the plasma-induced downward liquid flow using particle image velocimetry. Nitrogen (N₂) and oxygen (O₂) mixtures in different mixing ratios were supplied as surrounding gas around a helium (He) plasma jet at a constant flow rate. The results clearly indicated that O₂ in the surrounding gas plays a key role in enhancing the downward flow. Increasing the O₂ concentration increased the downward flow in the depth direction. An emission spectroscopy analysis suggested that reactive species related to excited atomic O were considered to be important for inducing downward flows. The relationship between the downward flows and oxidation reactions on a liquid target were discussed to determine the reasons responsible for the driving forces.

Original language	English
Article number	SHHF02
Journal	Japanese journal of applied physics
Volume	59
Issue number	SH
DOIs	https://doi.org/10.35848/1347-4065/ab71dc
Publication status	Published - May 1 2020

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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10.35848/1347-4065/ab71dc

Cite this

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title = "Effects of surrounding gas on plasma-induced downward liquid flow",

abstract = "Understanding the mechanisms behind plasma-induced liquid flow is important for the transport of reactive species in liquid. In this study, we studied the effects of the surrounding gas compositions of a plasma-jet on the plasma-induced downward liquid flow using particle image velocimetry. Nitrogen (N2) and oxygen (O2) mixtures in different mixing ratios were supplied as surrounding gas around a helium (He) plasma jet at a constant flow rate. The results clearly indicated that O2 in the surrounding gas plays a key role in enhancing the downward flow. Increasing the O2 concentration increased the downward flow in the depth direction. An emission spectroscopy analysis suggested that reactive species related to excited atomic O were considered to be important for inducing downward flows. The relationship between the downward flows and oxidation reactions on a liquid target were discussed to determine the reasons responsible for the driving forces.",

author = "Toshiyuki Kawasaki and Keisuke Nishida and Giichiro Uchida and Fumiaki Mitsugi and Kosuke Takenaka and Kazunori Koga and Yuichi Setsuhara and Masaharu Shiratani",

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T1 - Effects of surrounding gas on plasma-induced downward liquid flow

AU - Kawasaki, Toshiyuki

AU - Nishida, Keisuke

AU - Uchida, Giichiro

AU - Mitsugi, Fumiaki

AU - Takenaka, Kosuke

AU - Koga, Kazunori

AU - Setsuhara, Yuichi

AU - Shiratani, Masaharu

PY - 2020/5/1

Y1 - 2020/5/1

N2 - Understanding the mechanisms behind plasma-induced liquid flow is important for the transport of reactive species in liquid. In this study, we studied the effects of the surrounding gas compositions of a plasma-jet on the plasma-induced downward liquid flow using particle image velocimetry. Nitrogen (N2) and oxygen (O2) mixtures in different mixing ratios were supplied as surrounding gas around a helium (He) plasma jet at a constant flow rate. The results clearly indicated that O2 in the surrounding gas plays a key role in enhancing the downward flow. Increasing the O2 concentration increased the downward flow in the depth direction. An emission spectroscopy analysis suggested that reactive species related to excited atomic O were considered to be important for inducing downward flows. The relationship between the downward flows and oxidation reactions on a liquid target were discussed to determine the reasons responsible for the driving forces.

AB - Understanding the mechanisms behind plasma-induced liquid flow is important for the transport of reactive species in liquid. In this study, we studied the effects of the surrounding gas compositions of a plasma-jet on the plasma-induced downward liquid flow using particle image velocimetry. Nitrogen (N2) and oxygen (O2) mixtures in different mixing ratios were supplied as surrounding gas around a helium (He) plasma jet at a constant flow rate. The results clearly indicated that O2 in the surrounding gas plays a key role in enhancing the downward flow. Increasing the O2 concentration increased the downward flow in the depth direction. An emission spectroscopy analysis suggested that reactive species related to excited atomic O were considered to be important for inducing downward flows. The relationship between the downward flows and oxidation reactions on a liquid target were discussed to determine the reasons responsible for the driving forces.

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Effects of surrounding gas on plasma-induced downward liquid flow

Abstract

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