Comparative study of accommodation coefficients of helium and neon on clean tungsten under transition, temperature jump, and free molecule conditions

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Abstract
Measurements of heat conduction by neon and helium between concentric cylinders under free molecule, transition, and temperature jump conditions have been made with particular care to insure that a well defined clean surface state of the inner (tungsten) cylindrical surface was maintained. Several kinetic theoretical treatments applicable to the various regimes have been utilized to calculate the thermal accommodation coefficients of these gases. Comparison of these accommodation coefficient values obtained by analysis of the data in the transition and temperature jump regimes by the Smoluchowski‐Kennard temperature jump method, the Langmuir‐Wachman mean free path method, and the Lees‐Liu moment method with the accommodation coefficient values obtained on the same filament by the well established low pressure Knudsen method has been made, and the values are in remarkable agreement.