Influence of Polymer Vapor Concentration on Temperature of Ar Induction Thermal Plasmas During Polymer Solid Powder Injections

Tanaka, Yasunori; Numada, Toru; Uesugi, Yoshihiko; Kaneko, Shuhei; Okabe, Shigemitsu

doi:10.1541/ieejpes.125.1077

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…Among the four polymers, PMMA vapor produced the best cooling effect on the thermal plasma; specifically, it was found that a strong cooling effect was produced by an equivalent increase of the specific heat due to ionization of the polymer vapor at temperatures of 1000 to 2000 K [12,13]. On the other hand, as explained above, plasma cooling has little direct dependence on the heat required for melting and ablation.…”

Section: Effect Of Thermal Properties Of Ablated Vapor and Solid Polymentioning

confidence: 91%

Numerical simulation of thermal interaction between polymer and argon induction thermal plasma

Takeuchi

Tanaka

Uesugi

et al. 2009

Elect Comm in Japan

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SUMMARYInfluence of polymer powder injection into Ar thermal plasmas was investigated by numerical approaches. Thermal plasma-polymer solid coupling phenomena such as melting and evaporation were considered to study plasma-quenching effect of polymer injection. Dominant process for decay of plasma temperature was examined by changing thermodynamic parameters such as melting, boiling temperatures and their latent heats of solid and liquid polymers. As a result, thermodynamic properties of evaporated polymer vapor directly affect plasma-quenching phenomena more markedly than the properties of liquid and solid which influence plasma quenching efficiency through the amount of evaporation.

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Section: Effect Of Thermal Properties Of Ablated Vapor and Solid Polymentioning

confidence: 91%

Numerical simulation of thermal interaction between polymer and argon induction thermal plasma

Takeuchi

Tanaka

Uesugi

et al. 2009

Elect Comm in Japan

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“…We have already used inductively coupled thermal plasmas (ICTPs) for a fundamental study of various gas or polymer-ablated vapour effect on the temperature of highpressure thermal plasmas, neglecting effects of pressure rise and gas flow jet [17][18][19][20][21]. The ICTP presents the crucial advantage of no contamination because it uses no electrode, as does either dc or ac arc plasma.…”

Section: Introductionmentioning

confidence: 99%

“…It also has features of a good repeatability and controllability for experimental conditions. These advantages and features facilitate the investigation of the inherent characteristics of polymer-ablated vapours themselves on physical parameters of thermal plasmas such as the radiation intensity and the Ar excitation temperature [17,19,20]. In those experiments, polymer solid powders were actually injected into Ar induction thermal plasmas; then spectroscopic observations were carried out [19,20].…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on thermal interaction between thermal plasma and solid polymer powders using induction thermal plasma technique

Tanaka¹,

Takeuchi²,

Sakuyama³

et al. 2007

J. Phys. D: Appl. Phys.

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Abstract. Interaction between thermal plasma and polymer solid powders was investigated using inductively coupled thermal plasma (ICTP) technique. Interaction between thermal plasmas and polymers is extremely important, for example, for design of down-sized circuit breakers, because it fundamentally affects the interruption capability of the circuit breakers. The ICTP technique was used in the present work because it presents the advantages of no contamination and good repeatability. The polytetrafluoroethylene (PTFE), polymethylmethacrylate (PMMA), polyethylene (PE), and polyoxymethylene (POM) were treated as polymer materials. Numerical modelling for injection of polymer solid powders into Ar thermal plasma was also made including thermal interactions between thermal plasmas and polymer powders. Results showed that PMMA-ablated vapour has a higher plasma-quenching efficiency than others; the polymer solid properties affect the plasma-quenching ability indirectly. Comparison of the calculated results to experimental results, showed good agreement from the viewpoints of the spatial distribution of ablated vapour concentration and the average solid particle velocity.

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“…We have proposed the use of an inductively coupled thermal plasma (ICTP) technique for the fundamental study of the interactions between cold gas and thermal plasmas [1] and between solid powder and thermal plasmas [2], [3] to produce pure thermal plasmas with few impurities, which is favorable for this fundamental investigation. This paper reports the visualization of the spatial distribution of polymer-ablated vapor in ICTP with polymer powder.…”

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confidence: 99%

“…The plasma torch used here is the same torch with a threeturn induction coil used in our previous work [2]. Argon was supplied as a sheath gas, with a gas flow rate of 100 l/min.…”

mentioning

confidence: 99%

Spatial Distribution of $\hbox{C}_{2}$ Spectra From Induction Thermal Plasmas With Polymer Powder Injection

Tanaka

Sakuyama²,

Takeuchi³

et al. 2008

IEEE Trans. Plasma Sci.

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The influence of polymer ablation on thermal plasmas was fundamentally investigated by using the induction thermal plasma technique. Polymer powders were directly subjected to Ar-induction thermal plasmas. A high-speed video camera, with a bandpass filter, was used to measure the spatial distribution of the spectral radiation intensity of C 2 molecules included in the polymer-ablated vapor. Numerical prediction was also undertaken to obtain the C 2 molecular fraction distribution. Results directly show the mixing aspects of polymer-ablated vapor with thermal plasmas.Index Terms-Inductively coupled plasma, polymer ablation, thermal plasma. U NDERSTANDING the interaction between solid materials and thermal plasmas is increasingly important for various applications, such as thermal plasma material processing. The interaction between polymer materials and thermal plasmas is also crucial for the effective design of recently downsized circuit breakers. In high-voltage circuit breakers, for example, an arc plasma formed between the electrodes can contact a polymer nozzle during a current interruption process. Then, the heat and high-intensity radiation from the arc plasma cause the ablation of the polymer material. In this case, the polymer ablation invariably contaminates the arc plasma, changing the insulation and arc-quenching properties of the gas inside the circuit breaker. It also produces a jet gas flow and a marked pressure rise in the circuit breakers, involving the exchanges of mass, momentum, and energy between the polymer and the thermal plasmas. The aforementioned effects markedly affect the interruption capability of the circuit breaker. However, the polymer ablation phenomena and the resultant phenomena are very complex in the circuit breaker, which make it difficult to elucidate the polymer ablation effects.We have proposed the use of an inductively coupled thermal plasma (ICTP) technique for the fundamental study of the interactions between cold gas and thermal plasmas [1] and between solid powder and thermal plasmas [2], [3]. The ICTP requires no electrodes to be sustained. This feature enables us

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Influence of Polymer Vapor Concentration on Temperature of Ar Induction Thermal Plasmas During Polymer Solid Powder Injections

Cited by 8 publications

References 5 publications

Numerical simulation of thermal interaction between polymer and argon induction thermal plasma

Numerical simulation of thermal interaction between polymer and argon induction thermal plasma

Numerical and experimental investigations on thermal interaction between thermal plasma and solid polymer powders using induction thermal plasma technique

Spatial Distribution of $\hbox{C}_{2}$ Spectra From Induction Thermal Plasmas With Polymer Powder Injection

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