Critical analysis of viscosity data of thermal argon plasmas at atmospheric pressure

Chen, W. L. T.; Heberlein, J.; Pfender, E.

doi:10.1007/bf01447012

Cited by 22 publications

(8 citation statements)

References 22 publications

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“…The given technique undoubtedly reflects qualitatively correctly the physics of the process, however, it possibly needs a refinement in the quantitative respect, which needs separate research. An inaccurate information about thermophysical properties and transfer coefficients of the arc plasma (mainly the viscosity coefficient [7]) and the anode material, including too a small value of ∂Г/∂Т of the temperature gradient of the surface tension coefficient of the melt may be another reason for the discrepancy of the results. It is, besides, possible that the computed value of the plasma radial velocity component near the melt surface is too high and, as a consequence, too a high momentum transfer from the plasma flow to the melt.…”

Section: Comparison Of Computed Results With Experimental Datamentioning

confidence: 92%

Numerical modelling of unsteady heating and melting of the anode by electric arc. Part 2. Numerical characteristics of the anode weldpool

Urusov

Sultanova

Urusova

2012

Thermophys. Aeromech.

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Section: Comparison Of Computed Results With Experimental Datamentioning

confidence: 92%

Numerical modelling of unsteady heating and melting of the anode by electric arc. Part 2. Numerical characteristics of the anode weldpool

Urusov

Sultanova

Urusova

2012

Thermophys. Aeromech.

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“…For the calculation of thermophoretic separation efficiency, the reasonable values of Cs, Ct and Cm are 1.17, 2.18, and 1.14, respectively [23,24]. The gas property values were applied depending on the temperature [25,26,27]. It is assumed that the process gas temperature and particle temperature are the same.…”

Section: Methodsmentioning

confidence: 99%

The Control of Particle Size Distribution for Fabricated Alumina Nanoparticles using a Thermophoretic Separator

Kim

Song

Kim

et al. 2017

Preprint

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The control of particle size distribution of fabricated alumina nanoparticles from general alumina that has a large geometric standard deviation (GSD) is studied. A thermophoretic separator was used to control the GSD of the fabricated alumina nanoparticles. Unevaporated particles and primary particles were separated to yield a small GSD for fabricated alumina nanoparticles. The fabricated alumina nanoparticles were characterized by using a field emission scanning electron microscope and scanning mobility particle sizer. The GSD of the fabricated alumina nanoparticles was confirmed to be controlled by the thermophoretic separator. The temperature difference applied to the thermophoretic separator for the control of GSD of the fabricated alumina nanoparticles was between 79 K and 151 K. The GSD of the fabricated alumina nanoparticles was improved from 1.74 to 1.44.

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“…Due to the high dilution of the analyte relative to the carrier gas, fluid properties are assumed to be those of argon. Temperature dependent viscosities and thermal conductivities were fitted to literature data, 10,11 density is assumed to follow the ideal gas law. Due to the low level of ionization at temperatures below 10 000 K, the ideal gas law can be applied without corrections as described in the literature.…”

Section: A Computational Fluid Dynamics Modelmentioning

confidence: 99%

Plasma flow reactor for steady state monitoring of physical and chemical processes at high temperatures

Köroğlu

Mehl

Armstrong

et al. 2017

Review of Scientific Instruments

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We present the development of a steady state plasma flow reactor to investigate gas phase physical and chemical processes that occur at high temperature (1000 < T < 5000 K) and atmospheric pressure. The reactor consists of a glass tube that is attached to an inductively coupled argon plasma generator via an adaptor (ring flow injector). We have modeled the system using computational fluid dynamics simulations that are bounded by measured temperatures. In situ line-of-sight optical emission and absorption spectroscopy have been used to determine the structures and concentrations of molecules formed during rapid cooling of reactants after they pass through the plasma. Emission spectroscopy also enables us to determine the temperatures at which these dynamic processes occur. A sample collection probe inserted from the open end of the reactor is used to collect condensed materials and analyze them ex situ using electron microscopy. The preliminary results of two separate investigations involving the condensation of metal oxides and chemical kinetics of high-temperature gas reactions are discussed.

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Critical analysis of viscosity data of thermal argon plasmas at atmospheric pressure

Cited by 22 publications

References 22 publications

Numerical modelling of unsteady heating and melting of the anode by electric arc. Part 2. Numerical characteristics of the anode weldpool

Numerical modelling of unsteady heating and melting of the anode by electric arc. Part 2. Numerical characteristics of the anode weldpool

The Control of Particle Size Distribution for Fabricated Alumina Nanoparticles using a Thermophoretic Separator

Plasma flow reactor for steady state monitoring of physical and chemical processes at high temperatures

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