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rotating cavities - swirl decay

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Old   March 20, 2003, 00:46
Default rotating cavities - swirl decay
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I am working on rotating cavities. I would like to know, how swirl decays in the axial direction in an annular cavity between two concentric counter-rotating cylinders. Is there any empirical formula for this decay? Can we get this from Boundary layer theory? I need some quick help on this.

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