Aerobreakup in Rarefied Supersonic Gas Flows

[+] Author and Article Information
T. G. Theofanous

G. J. Li, T. N. Dinh

Center for Risk Studies and Safety, University of California, Santa Barbara, 6740 Cortona Drive, Goleta, CA 93117

J. Fluids Eng 126(4), 516-527 (Sep 10, 2004) (12 pages) doi:10.1115/1.1777234 History: Received May 27, 2003; Revised February 18, 2004; Online September 10, 2004
Copyright © 2004 by ASME
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Breakup regimes obtained at or near atmospheric conditions. All experiments were carried out at subsonic or mildly supersonic flow conditions. ST—shock tube, WT—Wind tunnel, NZ—Nozzle
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Schematic of the ALPHA facility
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A typical flow transient in ALPHA as deduced from measurements of static and stagnation pressures
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Summary of test conditions considered in this work
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Summary illustration of breakup regimes found in low pressure ALPHA tests for TBP drops (M=3)
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Summary illustration of breakup regimes found in low pressure ALPHA tests for Glycerin drops (M=3)
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Estimation of the number of piercing waves possible on an accelerating drop as a function of the Weber number. All ALPHA runs are represented. The scatter for TBP is due to small variation in diameter and degree of deformation (Φ12) observed. The solid points are explained in the text. The “to do” refers to key new conditions yet to be attained in future experiments.
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The “piercing” regime in ALPHA and relationship to the predictions of Eq. (8)
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“Multibag” breakup of a TBP drop in ALPHA (We=28,d=3.8 mm). Time interval between two adjacent images is 1 ms.
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“Piercing” breakup of a TBP drop in ALPHA (We=57,d=3.7 mm). Time interval between two adjacent images is 1 ms. is 1 ms.
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“Piercing” breakup of a TBP drop in ALPHA (We=109,d=3.9 mm). Time interval between two adjacent images is 2 ms.
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Mostly “Stripping” breakup of a TBP drop in ALPHA (We=2643,d=3.7 mm). Time interval between two adjacent images is 0.5 ms.
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“Bag” breakup of Glycerin drops in ALPHA. Time interval between two adjacent images is 1 ms.



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