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| Originální název: | Net Emission Coefficients of Radiation in Various Arc Plasmas |
|---|---|
| Český název: | Net Emission Coefficients of Radiation in Various Arc Plasmas |
| Anglický název: | Net Emission Coefficients of Radiation in Various Arc Plasmas |
| Autor(ři): | AUBRECHT, V.; BARTLOVÁ, M. |
| Typ: | abstrakt |
| Jazyk: | en |
| Originální abstrakt: | Net emission coefficients of radiation were calculated for various arc plasmas as a function of the plasma temperature (1 000 - 30 000 K), arc radius (0.01 to 10 cm) and the arc plasma pressures from 0.05 to 2 MPa. The following plasmas and their various mixtures have been taken into consideration: SF6, PTFE, Ar, N2, air, CO2, H2O, SF6+PTFE, SF6+PTFE+Cu, Ar+H2O, air+Cu, air+Fe, air+Ag. Temperature dependence of the net emission coefficients of radiation for various radii are presented in the form of viewgraphs. Both line and continuum radiations were considered in the calculations of the absorption coefficients which are related to the net emission coefficients of radiation. Photorecombination and bremsstrahlung radiation contribute to the continuous spectrum. The absorption coefficients of each spectral line depend on the line shape, where Doppler, Stark and resonance effects were respectively considered. More than 25 000 spectral lines altogether have been analysed and taken as an input to the computations. The fine multiplet structure and overlapping have also been taken into. Particular attention was given to the contribution of molecular species which have quite significant effect in low temperature regions. For the corresponding particular plasmas, we have accounted the following molecular species: SF6, N2, N2+, O2, NO, NO+, H2O, H2, C2, CN, CO, CO+, FeO, CuO, AgO. An important quantity in predictions of the thermal plasmas properties is the fraction of the plasma radiation that is in various region of the spectrum. An ultraviolet radiation is of central importance. It is usually emitted from the central parts of the plasma and re-absorbed in narrow layer at the edge. We have performed a comparison of net emission of radiation inherent to various spectral intervals. Definition of the net emission coefficients assumes isothermal plasma. Consequently, approximation of the radiation losses by using the net emission coefficients is valid only for a flat temperature distribution. In the outer and cooler parts of the plasma, prediction of energy balance using the net emission coefficients of radiation will not be accurate. In this case, method of partial characteristics is more appropriate. We have prepared extensive database of both net emission coefficients and partial characteristics of above mentioned kinds of thermal plasmas. |
| Český abstrakt: | Net emission coefficients of radiation were calculated for various arc plasmas as a function of the plasma temperature (1 000 - 30 000 K), arc radius (0.01 to 10 cm) and the arc plasma pressures from 0.05 to 2 MPa. The following plasmas and their various mixtures have been taken into consideration: SF6, PTFE, Ar, N2, air, CO2, H2O, SF6+PTFE, SF6+PTFE+Cu, Ar+H2O, air+Cu, air+Fe, air+Ag. Temperature dependence of the net emission coefficients of radiation for various radii are presented in the form of viewgraphs. Both line and continuum radiations were considered in the calculations of the absorption coefficients which are related to the net emission coefficients of radiation. Photorecombination and bremsstrahlung radiation contribute to the continuous spectrum. The absorption coefficients of each spectral line depend on the line shape, where Doppler, Stark and resonance effects were respectively considered. More than 25 000 spectral lines altogether have been analysed and taken as an input to the computations. The fine multiplet structure and overlapping have also been taken into. Particular attention was given to the contribution of molecular species which have quite significant effect in low temperature regions. For the corresponding particular plasmas, we have accounted the following molecular species: SF6, N2, N2+, O2, NO, NO+, H2O, H2, C2, CN, CO, CO+, FeO, CuO, AgO. An important quantity in predictions of the thermal plasmas properties is the fraction of the plasma radiation that is in various region of the spectrum. An ultraviolet radiation is of central importance. It is usually emitted from the central parts of the plasma and re-absorbed in narrow layer at the edge. We have performed a comparison of net emission of radiation inherent to various spectral intervals. Definition of the net emission coefficients assumes isothermal plasma. Consequently, approximation of the radiation losses by using the net emission coefficients is valid only for a flat temperature distribution. In the outer and cooler parts of the plasma, prediction of energy balance using the net emission coefficients of radiation will not be accurate. In this case, method of partial characteristics is more appropriate. We have prepared extensive database of both net emission coefficients and partial characteristics of above mentioned kinds of thermal plasmas. |
| Anglický abstrakt: | Net emission coefficients of radiation were calculated for various arc plasmas as a function of the plasma temperature (1 000 - 30 000 K), arc radius (0.01 to 10 cm) and the arc plasma pressures from 0.05 to 2 MPa. The following plasmas and their various mixtures have been taken into consideration: SF6, PTFE, Ar, N2, air, CO2, H2O, SF6+PTFE, SF6+PTFE+Cu, Ar+H2O, air+Cu, air+Fe, air+Ag. Temperature dependence of the net emission coefficients of radiation for various radii are presented in the form of viewgraphs. Both line and continuum radiations were considered in the calculations of the absorption coefficients which are related to the net emission coefficients of radiation. Photorecombination and bremsstrahlung radiation contribute to the continuous spectrum. The absorption coefficients of each spectral line depend on the line shape, where Doppler, Stark and resonance effects were respectively considered. More than 25 000 spectral lines altogether have been analysed and taken as an input to the computations. The fine multiplet structure and overlapping have also been taken into. Particular attention was given to the contribution of molecular species which have quite significant effect in low temperature regions. For the corresponding particular plasmas, we have accounted the following molecular species: SF6, N2, N2+, O2, NO, NO+, H2O, H2, C2, CN, CO, CO+, FeO, CuO, AgO. An important quantity in predictions of the thermal plasmas properties is the fraction of the plasma radiation that is in various region of the spectrum. An ultraviolet radiation is of central importance. It is usually emitted from the central parts of the plasma and re-absorbed in narrow layer at the edge. We have performed a comparison of net emission of radiation inherent to various spectral intervals. Definition of the net emission coefficients assumes isothermal plasma. Consequently, approximation of the radiation losses by using the net emission coefficients is valid only for a flat temperature distribution. In the outer and cooler parts of the plasma, prediction of energy balance using the net emission coefficients of radiation will not be accurate. In this case, method of partial characteristics is more appropriate. We have prepared extensive database of both net emission coefficients and partial characteristics of above mentioned kinds of thermal plasmas. |
| Klíčová slova: | net emission coefficients, thermal plasmas, radiation |
| Vydáno: | 16.06.2008 |
| Nakladatel: | ČVUT |
| Místo: | Praha |
| ISBN: | 978-80-01-04030-0 |
| Kniha: | Programme and Abstract Book of the 23rd Symposium on Plasma Physics and Technology |
| Strany od: | 60 |
| Strany do: | 60 |
| Strany počet: | 1 |
