Flow profile measurements of gas in a rotating cylinder.

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An azimuthal flow of the gas motion in a rotating cylinder induced by the forced source-sink flow was measured using the laser Doppler anemometer in connection with the development of a gas centrifuge for 235U enrichment. The cylinder, held vertically, was driven in the air at an angular velocity of 10 π rad/sec. The air to which paraffin mist was added as the light scattering particles was fed into the cylinder through the inlet slit provided on the upper end plate at the relative radius of 0.43 and withdrawn through the outlet slit on the lower end plate at the relative radius of 1.0. The Ekman number E was approximately 5.6 × 10-5 in this experiment. The Ekman layer on the upper end plate was so thin that it was not observed, and that on the lower end plate was not either. The Stewartson E1/4 layers on the side wall and at the feed radius were clearly observed and their profiles were quite similar to the result of the linear theory except the inviscid core region. The discrepancy in this region should be attributed to the fact that the Stewartson layers on the side wall and at the feed radius were thick enough to overlap each other.
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