Drag on an ellipsoid particle in free-molecular plasma flow |
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Authors: | Ming Li Yunming Chen D. B. Graves |
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Affiliation: | (1) Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, P.R. China;(2) Department of Chemical Engineering, University of California at Berkeley, 94720 Berkeley, California |
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Abstract: | Based on the analysis of molecular gas dynamics, the drag and moment acting on an ellipsoid particle of revolutionX 2/a 2+Y 2/a 2+Z 2/c 2=1, as an example of nonspherical particles, are studied under the condition of free-molecular plasma flow with thin plasma sheaths. A nonzero moment which causes nonspherical particle self-oscillation and self-rotation around its own axis in the plasma flow—similar to the pitching moment in aerodynamics—is discovered for the first time. When the ratio of axis lengthc/a is unity, the moment is zero and the drag formula are reduced to the well-known results of spherical particles. The effects of the particle-plasma relative velocity, the plasma temperature, and the particle materials on the drag and moment are also investigated. |
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Keywords: | Drag ellipsoid particles self-oscillating or self-rotating rarefied plasma flow |
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