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Atomization and Sprays
Facteur d'impact: 1.189 Facteur d'impact sur 5 ans: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v14.i5.10
40 pages

CAPILLARY STABILITY OF MODULATED SWIRLING LIQUID SHEETS

Carsten Mehring
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, USA
William A. Sirignano
Department of Mechanical and Aerospace Engineering, University of California at Irvine, USA

RÉSUMÉ

The linear and nonlinear distortion and breakup of three-dimensional swirling or nonswirling annular and swirling conical thin inviscid liquid films are analyzed by means of a reduced-dimension approach. The films are unbounded in the downstream direction and discharge from an annular slit nozzle or atomizer into a gas of negligible density at negligible gravity conditions. Nonlinear numerical simulations describe the distortion of modulated, initially undisturbed films up to the time when film rupture first occurs. Linear and nonlinear solutions are presented and discussed for various configurations and with either dilational or sinuous three-dimensional modulations imposed on the films at the nozzle exit. Nonlinear growth rates can be significantly larger than those predicted by linear theory. Initially, axisymmetric disturbances remain axisymmetric and fluctuations in the circumferential direction generated by numerical error are not amplified for the considered cases. Overall, film topology at the time of film rupture suggests that single dilational or sinuous oblique waves will result in spiraling filaments detaching from the continuous film. Combination of clockwise and counterclockwise traveling dilational waves results in an approximately rectangular array of larger ligaments interspaced by thin fluid films indicating subsequent cellular-type breakup for both annular and conical configurations. Results for similar sinuous-mode modulations suggest film disintegration via shedding of continuous annular rings from swirling annular films and filament shedding from swirling conical films.


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