Effect of Suction on the Stability of Flow on a Rotating Disk View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1992

AUTHORS

Manhar R Dhanak

ABSTRACT

The effect of distributed suction on the cross-flow instability of the boundary layer on a rotating disk is considered. A vorticity-velocity formulation is used to obtain exact linear equations governing the development of infinitesimal disturbances to the steady flow on a rotating disk. A parallel flow approximation is made as a first step in determining the effect of suction on the instability. It is shown that suction has a stabilizing effect on the flow while blowing is destabilizing. Small values of the suction parameter are found to significantly increase the critical Reynolds number associated with stationary modes of disturbances. The wave-angle of the spiral vortices which precede turbulent flow is estimated from critical conditions and is shown to decrease with increase in suction rate. This is shown to be consistent with prediction based on an inviscid analysis (cf Stuart in Gregory et. al 1955). The corresponding estimate of the expected number of vortices is shown to increase with suction. Suction appears to make the second minimum on the neutral curve (Malik 1986) more pronounced suggesting possible increase in the relative importance of the associated low wavenumber mode of disturbance. More... »

PAGES

151-167

Book

TITLE

Instability, Transition, and Turbulence

ISBN

978-1-4612-7732-3
978-1-4612-2956-8

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4612-2956-8_16

DOI

http://dx.doi.org/10.1007/978-1-4612-2956-8_16

DIMENSIONS

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