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Impinging jet flow and hydraulic jump on a rotating disk

Published online by Cambridge University Press:  02 February 2018

Yunpeng Wang  and
Roger E. Khayat Open the ORCID record for Roger E. Khayat [Opens in a new window]
Yunpeng Wang
Affiliation:
Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON N6A 5B9, Canada
Roger E. Khayat*
Affiliation:
Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON N6A 5B9, Canada
*
†Email address for correspondence: [email protected]
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Abstract

The free-surface flow formed by a circular jet impinging on a rotating disk is analysed theoretically. The study explores the effects of rotation and inertia on the thin-film flow. Both boundary-layer height and film thickness are found to diminish with rotation speed. A maximum film thickness develops in the supercritical region, which reflects the competition between the convective and centrifugal effects. Unlike the flow on a stationary disk, an increase in the wall shear stress along the radial direction is predicted, at a rate that strengthens with rotating speed. Our results corroborate well existing measurements. The location and height of the hydraulic jump are determined subject to the value of the thickness at the edge of the disk, which is established first for a stationary disk based on the capillary length, and then for a rotating disk using existing analyses and measurements in spin coating. The case of a stationary is revisited in an effort to predict the location and height of the jump uniquely. The formulated value of the height at the edge of the disk seems to give excellent results for a jet at moderately high flow rate (or low viscosity) where the jump structure is well identifiable in reality.

JFM classification

Boundary Layers: Boundary layer structure Interfacial Flows (free surface): Capillary flows Interfacial Flows (free surface): Interfacial Flows (free surface)
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 839 , 25 March 2018 , pp. 525 - 560
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Copyright
© 2018 Cambridge University Press 

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