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A Numerical Investigation of Unsteady Bubbly Cavitating Nozzle Flows

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Title A Numerical Investigation of Unsteady Bubbly Cavitating Nozzle Flows
 
Creator Preston, A. T.
Colonius, T.
Brennen, C. E.
 
Subject Caltech Library Services
 
Description The effects of unsteady bubbly dynamics on cavitating flow through a converging-diverging nozzle are investigated numerically. A continuum model that couples the Rayleigh-Plesset equation with the continuity and momentum equations is used to formulate unsteady, quasi-one-dimensional partial differential equations. Flow regimes studied include those where steady-state solutions exist, and those where steady-state solutions diverge at the so-called flashing instability. these latter flows consist of unsteady bubbly shock waves traveling downstream in the diverging section of the nozzle. An approximate analytical expression is developed to predict the critical backpressure for choked flow. The results agree with previous barotropic models for those flows where bubbly dynamics are not important, but show that in many instances the neglect of bubbly dynamics cannot be justified. Finally the computations show reasonable agreement with an experiment that measures the spatial variation of pressure, velocity and void fraction for steady shockfree flows, and good agreement with an experiment that measures the throat pressure and shock position for flows with bubbly shocks. In the model, damping of the bubbly raidal motion is restricted to a simple "effective" viscosity, but many features of the flow are shown to be independent of the specific damping mechanism.
 
Date 2002-01
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://authors.library.caltech.edu/138/1/PRE206.pdf
Preston, A. T. and Colonius, T. and Brennen, C. E. (2002) A Numerical Investigation of Unsteady Bubbly Cavitating Nozzle Flows. Physics of Fluids, 14 (1). pp. 300-311. ISSN 1070-6631. http://resolver.caltech.edu/CaltechAUTHORS:PREpf02 <http://resolver.caltech.edu/CaltechAUTHORS:PREpf02>
 
Relation http://resolver.caltech.edu/CaltechAUTHORS:PREpf02
http://authors.library.caltech.edu/138/