| Autor: |
Kruchinin, A. M., Pogrebisskiy, M. Ya., Ryazanova, E. S., Chursin, A. Yu. |
| Zdroj: |
Inorganic Materials: Applied Research; Jun2023, Vol. 14 Issue 3, p649-655, 7p |
| Abstrakt: |
A method is developed to calculate universal electric and thermal properties in cylindrical part of the column in the Maecker model. This approach comprises simple algebraic techniques to estimate the properties of the arc column away from the cathode, which allows rectifying the Maecker model. As the theory of the boundary layer predicts, the conservatism of the arc stemming from developing a spatial layer with increased bulk viscosity on the surface of the column allows applying the boundary condition of the third kind to the surface of the cylindrical part of the arc column. The method of universal arc properties also helps associate the boundary value of the linear density of the heat flux on the surface of the cylindrical part of the column with the temperature profile of the column specifying the electrical, geometrical, and thermal properties of the plasma column with conditions of heat exchange between the arc and the working space of the installation having electric arc heating. The method proposed makes use of external current–voltage parameters of the arc to identify the Maecker heat exchange model and to calculate in a straightforward algebraic manner the structure and heat fluxes generated by the arc when the heat exchange develops with the plasmatron gas jet inside the melting space of the plasma torch. Examples of the arc properties are given for operations using various gases at different melting stages: at the beginning of melting and during melting of the charge. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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