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Aerobreakup in disturbed subsonic and supersonic flow fields

Published online by Cambridge University Press:  23 November 2007

T. G. THEOFANOUS ,
G. J. LI ,
T. N. DINH  and
C.-H. CHANG
T. G. THEOFANOUS
Affiliation:
Center for Risk Studies and Safety, University of California, Santa Barbara, CA 93106, USA
G. J. LI
Affiliation:
Center for Risk Studies and Safety, University of California, Santa Barbara, CA 93106, USA
T. N. DINH
Affiliation:
Center for Risk Studies and Safety, University of California, Santa Barbara, CA 93106, USA
C.-H. CHANG
Affiliation:
Center for Risk Studies and Safety, University of California, Santa Barbara, CA 93106, USA
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Abstract

This work concerns the breakup of millimetre-scale liquid droplets in gaseous flow fields that are disturbed from free-stream conditions by the presence of solid obstacles or other drops. A broad range of flow conditions is considered – from subsonic to supersonic, from highly rarefied to ambient pressures, and from fixed cylindrical obstacles to free liquid droplets (as obstacles). The liquid is water or tributyl phosphate, a water-like low-viscosity fluid of very low vapour pressure. We present data on deformation and breakup regimes, and, aided by numerical simulations, we discuss governing mechanisms and the time scaling of these events. Thereby a methodology is demonstrated for conveniently forecasting first-order behaviours in disturbed flow fields more generally. The highly resolved images lend themselves to testing/benchmarking numerical simulations of interfacial flows. These results, along with the experimental capability developed, constitute one of the key building blocks for our overall long-term aim towards predicting ultimate particle-size distributions from such intense aerodynamic interactions involving very large quantities of Newtonian and viscoelastic liquids.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 593 , 25 December 2007 , pp. 131 - 170
Copyright
Copyright © Cambridge University Press 2007

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