Acoustic field in cavities filled with thermo-viscous binary gas mixtures, determination of gas mixtures thermophysical properties
Résumé
The acoustic behaviour in thermo-viscous gas mixtures involves deviations from the adiabatic and laminar movement in pure gases, which results from the influence of several diffusive fields, namely shear, entropic, and concentration variation fields, taking their energy to the acoustic field itself. Actually, a strong coupling between these fields occurs inside boundary layers while their effects appear to be additive processes in the bulk of the medium. Although recent literature on this subject leads to results of interest, these results still have limitations because they do not provide complete solutions for the propagative and diffusive fields in and out of the boundary layers. The aim of this work is to provide such complete solutions in the whole domains considered, in order to get a better analytical understanding of the fields abovementioned in closed cavities and ducts. More particularly here, we consider the possible use of acoustic methods in spherical cavities for the accurate determination of binary gas mixtures thermophysical properties (speed of sound, first acoustic virial coefficient, thermal conductivity, mutual diffusion coefficient), that have been greatly improved during the past two decades.
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