Characteristics of water thermal plasma for biomass utilization system

Ozeki, Yutaro; Matsuo, Tsuyoshi; Tanaka, Manabu; Watanabe, Takayuki

doi:10.1299/jfst.2017jfst0022

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…Watanabe and his colleagues have reported their experimental works about successful decomposition of water-soluble organic compounds [39][40][41] and biomass utilization. 42) Water-solution waste includes not only organic compounds but also metals occasionally. When a water plasma jet is generated directly using such solution waste as the source, it is presumed that metal substances are transported with the high- The Japan Society of Applied Physics by IOP Publishing Ltd temperature plasma flow and form aerosol at the plasma fringe.…”

Section: 22mentioning

confidence: 99%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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This article reviews and discusses the recent progresses of studies with the concept of “Computational plasma fluid mechanics”. Computational demonstrations show that the inhouse simulation codes such as PLASTIPC (PLasma All-Speed Turbulence with Implicit Pressure Code) have captured hydrodynamic instabilities and reproduced flow dynamics in thermal plasma – nonionized gas coexisting systems. A unique method has made it feasible to study collective growth of binary alloy nanoparticles by numerical analysis. SPH (Smoothed Particle Hydrodynamics) method with incompressibility modification has achieved complex behaviors of molten metal involving phase change, flow, heat transport, material mixing, and large deformation during arc welding. It is essential to study thermal plasma processes as comprehensive fluid systems in which hot plasma, cold nonionized gas, and materials coexist. The viewpoint and approaches of fluid mechanics as well as plasma physics are indispensable. Computational study will play a more important role in giving us new and deeper insights.

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Section: 22mentioning

confidence: 99%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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“…However, a fundamental arc characteristic of the water plasma is not clari ed despite the importance of the arc characteristics in thermal plasma torches (Dorier et al, 2001;Duan and Heberlein, 2002). ere is only one study dealing with the identi cation of arc uctuation using water plasma (Ozeki et al, 2017). However, this study mainly focused on the decomposition of D-glucose.…”

Section: Introductionmentioning

confidence: 99%

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Kim

Tanaka

Watanabe

et al. 2021

J. Chem. Eng. Japan

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The present study investigates the arc behavior and temperature distribution in a water plasma with mist generation under di erent mist feeding rates. The arc uctuation was observed using a high-speed camera with arc voltage measurement. Further, the arc temperature was visualized by a high-speed video camera and band-pass lters based on the Boltzmann plot method. The experimental results showed that the arc uctuation was in the restrike mode, and the frequency as well as the arc length apparently increased with an increase of mist feeding rate due to stronger drag force. Higher arc existence probability was also observed. At the same time, the mist feeding rate played an important role in controlling the arc area with high temperature. This study will open up new opportunities for waste treatment by understanding the fundamental arc characteristics in a water plasma system.

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“…Many studies have been carried on the properties of thermal plasmas. Studies on synthesis of functional ne particle (Shigeta and Murphy, 2011;Kambara et al, 2014), and detoxi cation of industrial waste (Heberlein and Murphy, 2008;Watanabe and Narengerile, 2013), and technology for extracting energy from industrial waste (Ozeki et al, 2017) were reported. ermal plasma sources are classi ed into several types, and the optimal one is selected in consideration of the purpose and feature of each plasma source.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Arc Behavior and Temperature Distribution Corresponding to Electrode and Phase Configurations in a Multiphase AC Arc

Okuma

Maruyama

Imatsuji

et al. 2020

J. Chem. Eng. Japan

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E ects of electrode and phase con gurations on arc behavior and temperature distribution in a multiphase AC arc were successfully clari ed. A high-speed video camera with band-pass lters were addressed to measure the arc. A multiphase AC arc is promising material processing technology owing to the characteristics of large high-temperature volume and high energy e ciency. The arc behavior was observed by imaging arc discharge with a high-speed camera in millisecond time scale. The temperature was conducted by Boltzmann plot method using two types of argon line emissions ltered by the band-pass lters. The obtained excitation temperature is high with a range of 7.0 10 3 to 1.3 10 4 K. The arc swing in front of electrode becomes wider and the temperature uniformity improves as the number of electrodes and phases increase. The characteristic time due to uctuation of 12-phase AC arc was 1.4 ms, which was su ciently shorter than the residence time of raw material in the arc. The 12-phase AC arc is useful for material processing in terms of temperature uniformity and uctuation time.

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Characteristics of water thermal plasma for biomass utilization system

Cited by 9 publications

References 9 publications

Progress of computational plasma fluid mechanics

Progress of computational plasma fluid mechanics

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Investigation of Arc Behavior and Temperature Distribution Corresponding to Electrode and Phase Configurations in a Multiphase AC Arc

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