A Power Interruption Technique for Determining the Difference Between Electron and Gas Temperatures in the Argon d.c. Arc Supplied with Aqueous Aerosol

Abstract

The difference between electron and gas temperatures in a low current U-shaped d.c. arc with aqueous aerosol supply was studied using a power interruption technique. Monitoring of the temporal evolution of recombination continuum after power switch-off revealed that it was necessary to do a correction of the measured values due to a change in electron concentration. It was shown that the plasma studied was a two temperature type and that the temperature difference ranges from 1850 K to 600 K for arc currents from 3 to 10.5 A, respectively. A comparison with literature results for pure argon arc plasma shows that aerosol introduction reduces the temperature difference.

A Power Interruption Technique for Investigation of Temperature Difference in Stabilized Low Direct-Current Arc Burning in Pure Argon on Atmospheric Pressure

“…Therefore, studied plasma is not in the LTE state but gradually approaches that state with increasing current: the difference between variously defined temperatures is reduced with electron number density increase. By comparing these results with the previously published, [8] obtained using the same arc device but with water aerosol introduction, it may be concluded that water aerosol increases kinetic energy transfer efficiency, i.e. reduces T e − T h difference and brings plasma closer to the LTE state.…”

“…Rough comparison of our previous results for argon plasma with aerosol introduction. [8] with the results for pure argon arc plasma. [1,2] has shown that this influence manifests itself in substantial decrease of the difference between T e and T h .…”

“…Concerning the fact that similar investigations were performed with exactly the same arc device and under the same experimental conditions but with water aerosol introduction, we thought that obtained results will give valuable insight into influence of water aerosol on argon plasma properties. [8,9] Namely, in the literature there is a lack of comparative data concerning this influence especially for this type of plasma. Rough comparison of our previous results for argon plasma with aerosol introduction.…”

The effect of potassium addition on plasma parameters in argon dc plasma arc

“…For heavy particle temperature T h evaluation we have used a power interruption method [29][30][31]. From the measured temporal evolutions of argon spectral lines after power switchoff we have obtained the ratio of the spectral line intensities before (I 0 ) and after (I ) the interruption.…”

Delayed responses of analyte emission in a pulse-modulated direct-current argon arc at atmospheric pressure

“…Also, the relatively long horizontal part of the arc column makes it suitable for atomic absorption measurements, especially for elements that form refractory oxides [13]. In this source, fast responses of spectral line intensities to power interruption were studied for a number of atomic species, to get a better insight into the different excitation mechanisms that occur in the arc plasma [14], and also to get information regarding the state of thermodynamic equilibrium [15][16][17]. A power modulation method was used to investigate delayed responses of argon and hydrogen spectral lines and also of continuum radiation [18].…”