Separation of gas mixtures in free jets

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Abstract
Spatial distributions of species flux in axisymmetric free jets of helium‐argon mixtures were determined experimentally. The experiments encompass the transition range between inviscid and free molecular flow at the exits of the nozzles forming the jets. Comparison is made with existing theories of separation. The results confirm the validity of Sherman's predictions and Rothe's measurements of diffusive separation for nearly inviscid flow. In the transition range departures from the nearly inviscid theory occur. The maximum degree of separation is observed in this range.

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