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Measurements of vibrational and rotational temperatures of YO molecule by emission and absorption spectroscopy in a solar process

Evidence of a non-equilibrium situation near the vaporizing surface

Published online by Cambridge University Press:  21 March 2007

J. M. Badie ,
L. Cassan  and
B. Granier
J. M. Badie
Affiliation:
PROMES-CNRS, Procédés Matériaux et Énergie Solaire, BP 5, 66125 Font-Romeu, France
L. Cassan
Affiliation:
PROMES-CNRS, Procédés Matériaux et Énergie Solaire, BP 5, 66125 Font-Romeu, France
B. Granier*
Affiliation:
PROMES-CNRS, Procédés Matériaux et Énergie Solaire, BP 5, 66125 Font-Romeu, France
*
granier@promes.cnrs.fr
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Abstract

We measure by fluorescence emission and absorption spectroscopy rotational and vibrational temperature of YO molecule issuing from a liquid drop of Y2O3 melted at the focus of a solar furnace. Far from the surface and at high pressure these measurements are consistent with the predictions from a fluid dynamic calculation and are believed to give an approximate temperature of the gas phase surrounding the sample. Close to the surface and at low pressure these measurements disagree with the expected surface temperature. This results from the existence of a Knudsen layer near the vaporizing surface that, in these conditions and at our spatial resolution, we can explore, revealing according the gas pressure, quasi equilibrium or non-equilibrium conditions.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 38 , Issue 2 , May 2007 , pp. 177 - 181
Copyright
© EDP Sciences, 2007

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References

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