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Numerical Analyses of Fluid Dynamics of an Atomization Configuration

Published online by Cambridge University Press:  31 January 2011

Q. Xu ,
D. Cheng ,
G. Trapaga ,
N. Yang  and
E.J. Lavernia
Q. Xu
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California 92697
D. Cheng
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California 92697
G. Trapaga
Affiliation:
Laboratory of Investigation in Materials of CINVESTAV-IPN, Unidad Quertaro, C.P. 76230, Quertaro, Qro, Mexico
N. Yang
Affiliation:
Organization 8715, Sandia National Laboratories, 7011 East Avenue, P.O. Box 969, Livermore, California 94550
E.J. Lavernia
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California 92697
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Abstract

Computational fluid dynamic techniques were used to analyze the gas flow behavior of a typical atomization configuration. The calculated results are summarized as follows. The atomization gas flow at the atomizer's exit may be either subsonic at ambient pressure or sonic at an underexpanded condition, depending on the magnitude of the inlet gas pressure. When the atomization gas separates to become a free annular gas jet, a closed recirculating vortex region is formed between the liquid delivery tube and the annular jet's inner boundary. Upon entering the atomization chamber, an underexpanded sonic gas flow is further accelerated to supersonic velocity during expansion. This pressure adjustment establishes itself in repetitive expansion and compression waves. A certain protrusion of the liquid delivery tube is crucial to obtain a stable subatmospheric pressure region at its exit. The vortex flow under the liquid delivery tube tends to transport liquid metal to the high kinetic energy gas located outside the liquid delivery tube, thereby leading to an efficient atomization.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 1 , January 2002 , pp. 156 - 166
Copyright
Copyright © Materials Research Society 2002

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