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Title: Vortex breakdown in an enclosed cylinder with a partially rotating bottom-wall
Authors: Yu, P. 
Lee, T.S. 
Zeng, Y. 
Low, H.T. 
Keywords: Recirculation flow
Swirling flow
Vortex breakdown
Issue Date: Nov-2008
Citation: Yu, P., Lee, T.S., Zeng, Y., Low, H.T. (2008-11). Vortex breakdown in an enclosed cylinder with a partially rotating bottom-wall. Journal of Fluids Engineering, Transactions of the ASME 130 (11) : 1111011-11110112. ScholarBank@NUS Repository.
Abstract: A numerical study of the axisymmetric flow in a cylindrical chamber of height H is presented, which is driven by a bottom disk rotating at angular velocityΩ. However, unlike most previous studies, the present rotating disk is of smaller radius than the bottom-wall. The boundary curves for the onset of vortex breakdown are presented using different definitions of the nondimensional parameters, depending on whether the cylinder radius R or the disk radius rd is used as the length scale. The study shows that the boundary curves are best correlated when presented in terms of the Reynolds number Ωrd 2/v, aspect ratio H/R, and cylinder-to-disk ratio R/rd. The cylinder-to-disk ratio R/r d up to 1.6 is found to have noticeable effect on vortex breakdown; this is attributed to the change of effective aspect ratio. The contours of streamline, angular momentum, and azimuthal vorticity are presented and compared with those of whole bottom-wall rotation. Copyright © 2008 by ASME.
Source Title: Journal of Fluids Engineering, Transactions of the ASME
ISSN: 00982202
DOI: 10.1115/1.2969427
Appears in Collections:Staff Publications

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