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Atomization and Sprays

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ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v14.i1.50
11 pages

THE FRACTAL GEOMETRY OF ROUND TURBULENT CRYOGENIC NITROGEN JETS AT SUBCRITICAL AND SUPERCRITICAL PRESSURES

Bruce Chehroudi
Engineering Research Consultants, Inc. 10 E. Saturn Blvd., Edwards AFB, CA, USA 93524-7680
Douglas Talley
USAF Research Lab

ABSTRACT

Box-counting and Euclidean distance mapping (EDM) methods were used to measure the fractal dimension of round turbulent cryogenic nitrogen jets at pressures ranging from subcritical to supercritical pressures. Both methods produced similar trends, with close quantitative agreement for a suitably small box-counting scale. At subcritical pressures, the fractal dimension was found to be consistent with the fractal dimension of a spray in the second wind-induced atomization regime. The fractal dimension tended to increase as pressure increased, until at supercritical pressures the fractal dimension was found to be consistent with that of gas jets and mixing layers. The results constitute additional quantitative evidence for the hypothesis that subcritical jets exhibit mainly spraylike behavior, while supercritical jets exhibit mainly gaslike behavior. This appears to have been the first time pressure effects on the fractal dimension of turbulent jets have been measured.