Natural Breakdown of Planar Jets

[+] Author and Article Information
D. O. Rockwell

Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pa.

W. O. Niccolls

Fluid Systems Research Branch, Harry Diamond Laboratories, Washington, D. C.

J. Basic Eng 94(4), 720-728 (Dec 01, 1972) (9 pages) doi:10.1115/1.3425533 History: Received November 22, 1971; Online October 27, 2010


The growth of planar jets is studied using the hydrogen bubble technique of flow visualization. A five-fold range of nozzle exit Reynolds number (1860 to 10,800) is considered. Generation of streaklines and timelines permits characterization of the process of vortex formation and coalescence. Both symmetrical and asymmetrical modes of vortex growth and coalescence, along with the resultant deformation of the jet core flow, are examined. Nascent and mature stage coalescence are defined and portrayed. Vortex axial transport velocity and frequency of formation of the vortices are evaluated for selected Reynolds numbers.

Copyright © 1972 by ASME
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