Abstract
Nitrogen jet studies in the transition continuous-to-free molecular regime performed on a law-density wind tunnel at the Institute of Thermophysics are reported. From the measurements of density, rotational level population and free molecular pressure the mean mass flow rate is estimated. From the obtained jet and penetrating gas density distributions the distribution of the local mass flow rate of the penetrating gas is plotted in the range of Reynolds numbers from 10 to 100. Also given are the distributions of the total mass flow rate of the evacuated gas. The maximum ratio of the evacuated gas flow rate to the total mass flow rate of the jet is found in the range of Re L = 20. The estimation of jet regimes in cold diffusion pumps shows that for the maximum evacuated gas flow rate the Re L are close to the Reynolds numbers for the jets with the maximum ejecting action.
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