Schematic image of the experimental apparatus.
Analog electrical circuit to maintain the platinum thin wire temperature constant.
Schematic image of potential lead and measured voltage to avoid the edge effect.
Cross-sectional schema of the heat transfer between coaxial cylinders.
Normalized distributions on (a) pressure and (b) temperature, according to Eq. (A1), in the gap between the cylinders, solid line Ar12 case, dashed line Ar19 case, δ = 0.05.
Pressure dependence of the heat flux between cylinders, the experimental values (• symbols), the results of numerical simulation (– solid line), fitting curve by relation (2) (−− dashed line), see Table I.
Heat flux between the cylinders, normalized by the corresponding free molecular value, Eq. (1). The measured values (• symbols), the results of numerical simulation (– solid line), fitting curve by relation (2) (−− dashed line), see Table I.
Reference value on the normalization, which is heat flux in the free molecular regime q FM , Eq. (1) (– solid line) compared with the residual |q − q e | of the measured values q e to fitting curve q, relation (2) (• symbols).
The temperature dependence of the thermal accommodation coefficient: the accommodation coefficient was measured for 4 times for each experimental condition to show the repeatability.
The experimental conditions: the average values of the temperatures of the internal T H and the external T C cylinders.
The accommodation coefficient obtained from the experiments.
The heat flux q r in the middle point (r = 0.75) vs rarefaction parameter δ for the case T H /T C = 2 and R C /R H = 2.
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