Rarefied Flows of the Monatomic Gas in an Axi-Symmetric Expansion Nozzle
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概要
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Rarefied transition flows in a nozzle with the form of an asymptotic cone arecalculated for the throat Knudsen-number K. less than 0.3 by using the directsimulation Monte Carlo method. The properties near the nozzle axis are asfollows: (I) as K. increases, conversion of the thermal energy into the kineticenergy becomes less efficient, and hence the overall temperature increases whereasthe mean velocity decreases, (2) the number density is barely affected by K.,(3) the rate of divergence of the parallel temperature T. and the perpendiculartemperature T, increases with K.; as the nozzle area-ratio increases, T, graduallyrises above the equilibrium temperature to approach the frozen limit, whereas T,drops beIow4he equilibrium temperature. These.behaviors of T., T. in the nozzleflow are similar to those in the spherical expansion flow because of the analogyof the flow?field between the two.
- 社団法人日本物理学会の論文
- 1980-06-15
著者
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Watanabe Yasuo
Institute Of High Speed Mechanics Tohoku University
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Nanbu Kenichi
Institute For Fluid Science Tohoku University
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