Oscillation in Height of a Negatively Buoyant Jet

[+] Author and Article Information
P. D. Friedman

Department of Mechanical Engineering, University of Massachusetts Dartmouth, Dartmouth, MA 02747pfriedman@umassd.edu

J. Fluids Eng 128(4), 880-882 (Dec 01, 2005) (3 pages) doi:10.1115/1.2201647 History: Received March 14, 2005; Revised December 01, 2005

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Copyright © 2006 by American Society of Mechanical Engineers
Topics: Oscillations
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Grahic Jump Location
Figure 1

(a) Negatively buoyant fountain discharging into a lighter fluid above; (b) Negatively buoyant jet impinges on an interface with a lighter fluid

Grahic Jump Location
Figure 2

(a) Stable, nonoscillatory flow pattern above the transitional Richardson number (Ri>1). For (Ri<1) a cycle develops that starts with (b), the formation of a tall unstable fountain, which loses symmetry (c) and collapses (d)

Grahic Jump Location
Figure 3

Amplitude of oscillation in height of a negatively buoyant jet [(hUpper−hLower)∕hLower×100%], where hUpper=h¯Max+σhMax (the average height at the top of the oscillations plus the standard deviation in the upper height). The lower height is defined similarly hLower=h¯Min−σhMin

Grahic Jump Location
Figure 4

Oscillation frequency of a negatively buoyant jet in terms of a dimensionless Strouhal number (fD∕U).



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