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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2007, Volume11

149 pages

DOI: 10.1615/HighTempMatProc.v11.i2

Issue price - $168.00

INTERACTION OF HOT GAS MIXTURE FREE JET WITH SURROUNDING AIR

J. Gregor
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic

I. Jakubova
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic

T. Mendl
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic

J. Senk
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic

M. Konrad
Institute of Plasma Physics, Academy of Sciences of the Czech Republic, Za Slovankou - P. O. Box 17 182 21 Prague 8 - Czech Republic

ABSTRACT

The paper analyses an interaction of the hot gas mixture free jet generated by a hybrid water-argon arc heater with the surrounding air of atmospheric pressure. An entrainment of air into the jet is investigated as diffusion of original components of the jet into the ambient air. The calculation is based on the continuity and momentum equations of the plasma jet together with continuity equations describing diffusion of individual components of the hot gas mixture. The input data are arc heater's efficiency, temperature and velocity profiles measured along the jet and thermodynamic and transport properties of the gas mixture. First, the ratio of concentrations of water vapour and argon in the mixture, the flow rate and the momentum of hot mixture at the arc heater's output are determined. The model enables to calculate the distribution of mass fractions of individual species of the hot gas mixture and the radial component of velocity. The character of flowing can be estimated, and the axial dependencies of the velocity half-width, the turbulence coefficient, and the rate of laminar and turbulent viscosity coefficient can be obtained.