A numerical study of the axisymmetric flow in a cylindrical chamber of height is presented, which is driven by a bottom disk rotating at angular velocity . 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 or the disk radius is used as the length scale. The study shows that the boundary curves are best correlated when presented in terms of the Reynolds number , aspect ratio , and cylinder-to-disk ratio . The cylinder-to-disk ratio 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.
Vortex Breakdown in an Enclosed Cylinder With a Partially Rotating Bottom-Wall
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Yu, P., Lee, T. S., Zeng, Y., and Low, H. T. (September 19, 2008). "Vortex Breakdown in an Enclosed Cylinder With a Partially Rotating Bottom-Wall." ASME. J. Fluids Eng. November 2008; 130(11): 111101. https://doi.org/10.1115/1.2969427
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