Energy accommodation coefficient extracted from acoustic resonator experiments

2016 
The authors review values of the temperature jump coefficient ζT determined from measurements of the acoustic resonance frequencies facoust of helium-filled and argon-filled, spherical cavities near ambient temperature. The authors combine these values of ζT with literature data for tangential momentum accommodation coefficient (TMAC) and the Cercignani-Lampis model of the gas–surface interaction to obtain measurement-derived values of the normal energy accommodation coefficient (NEAC). The authors found that NEAC ranges from 0 to 0.1 for helium and from 0.61 to 0.85 for argon at ambient temperature for several different surfaces. The authors suggest that measurements of facoust of gas-filled, cylindrical cavities and of the nonradial modes of quasispherical cavities might separately determine TMAC and NEAC. Alternatively, TMAC and NEAC could be determined by measuring the heat transfer and momentum transfer between parallel rotating disks at low pressure.
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