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Energy accommodation coefficient extracted from acoustic resonator experiments



Felix Sharipov, Michael R. Moldover


We review values of the temperature jump coefficient zeta_T determined from measurements of the acoustic resonance frequencies f_acoust of helium-filled and argon-filled, metal-walled, quasi- spherical cavities near ambient temperature. We combine these values of zeta_T 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). We found that NEAC ranges from 0 to 0.1 for helium and from 0.61 to 0.85 for argon at ambient temperature. We suggest measurements of f_acoust of gas- filled, cylindrical cavities and of the non-radial modes of quasi-spherical 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 discs at low pressure.
Journal of Vacuum Science & Technology A


acoustic resonator, temperature jump coefficient, tangential momentum accommodation coefficient, normal energy accommodation coefficient, rarified gas
Created November 2, 2016, Updated November 10, 2018