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ISSN Print: 1093-3611
ISSN Online: 1940-4360

# High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v13.i2.60
pages 179-188

## ANALYSIS OF RADIAL ENERGY LOSS IN AN ARC HEATER CHANNEL

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
J. Senk
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic
A. Maslani
Institute of Plasma Physics AS CR, Za Slovankou 3 182 00 Prague 8

### ABSTRACT

The paper deals with an experimental modular-type arc heater with the blasted electrical arc burning in argon. Its typical operating parameters are current up to 220 amperes, voltage about 100 volts, and argon flow rate up to 22 grams per second. Numerous experiments were carried out and many sets of integral quantities were measured. The measured data, including the arc current I, the arc voltage U, the flow rate of the working gas G, and the energy loss of the arc heater channel Pz, served as the input data of a mathematical-physical model describing phenomena inside the arc heater channel. The model is based on the mass and energy conservation equations and Ohm law and uses the known material properties of the working gas. The model makes it possible to study energy flows both in axial and radial directions. In this paper, attention is focused on radial energy transport in the anode channel. The analysis of measured and computed data has proved radiation to be the main mechanism of radial energy transfer from the arc to the channel wall. Using the computed radial dependence of the temperature T(r) in the arc heater channel cross-section, and the energy loss Pz and the electrical intensity E along the arc heater axis together with the temperature dependency of argon electrical conductivity σ(T), the specific radiation coefficient we of the working gas can be approximately estimated in the limited temperature range. The obtained temperature dependency of the specific radiation coefficient of argon is given in figures and compared with theoretically computed data.

### REFERENCES

1. Aubrecht V. and Bartlova M., Net emission coefficients of radiation in H2O and argon plasmas.

2. Gregor J, Jakubova I, Kolarsky J, and Senk J., Energy loss characteristics of the arc heater with stepwise extended anode.

3. Heinz J. and Senk J., Modelling of energy processes in intensively blasted electric arc.

4. Farmer A.J. and Haddad G.N., Material Functions and Equilibrium Composition of Argon Plasma.

5. Ramakrishnan S., Stokes A.D., and Lowke J.J., An approximate model for high-current free-burning arcs.

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