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Complete adiabatic evaporation of highly superheated liquid jets

Published online by Cambridge University Press:  26 April 2006

Th. Kurschat ,
H. Chaves  and
G. E. A. Meier
Th. Kurschat
Affiliation:
Max-Planck-Institut for Strömungsforschung, D-3400 Göttingen, Germany
H. Chaves
Affiliation:
Max-Planck-Institut for Strömungsforschung, D-3400 Göttingen, Germany
G. E. A. Meier
Affiliation:
Max-Planck-Institut for Strömungsforschung, D-3400 Göttingen, Germany
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Abstract

A nozzle expansion into a vacuum chamber was used to investigate the evaporation of highly superheated liquid jets. The large molar specific heat of fluids with high molecular complexity — in this case C6F14 — is responsible for the new phenomena reported here. A model was developed to describe the basic physical effects. A cubic equation of state was used to describe the thermodynamic properties of the fluid. The evaporation was modelled as a sonic deflagration followed by an axisymmetric supersonic expansion. As in the case of hypersonic gas jets the final state is reached by a normal shock. For sufficiently high temperatures and expansion ratios a complete adiabatic evaporation of the liquid was found. At even higher temperatures the liquid evaporates completely within a rarefaction discontinuity. The predictions of the model are in good agreement with the experimental results.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 236 , March 1992 , pp. 43 - 59
Copyright
© 1992 Cambridge University Press

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