Oblique evaporation waves |
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Authors: | José R Simões-Moreira |
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Institution: | SISEA, Alternative Energy Systems Laboratory, Mechanical Engineering Department, Escola Politécnica da USP, Caixa postal 61548, S?o Paulo, SP, Brazil (e-mail: jrsimoes@usp.br), BR
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Abstract: | Evaporation waves are processes that may occur under certain conditions in which a metastable or superheated liquid undergoes
a sudden phase transition in a narrow and observable region, which resembles a shock wave. It is inferred from photographic
documentation that in certain liquid jet flashing regimes the phenomenon is present. The evaporation wave discontinuity has
been successfully modeled in a similar way as a deflagration wave in a combusting gas. One-dimensional laboratory experiments
have demonstrated the existence of the (lower) Chapman-Jouguet solution for the cases where the liquid were at a high degree
of metastability. Subsonic solutions were also observed for less pronounced degree of metastability (Hill 1991, Sim oes-Moreira
1994). In this paper, the fundamental theory is briefly revised and compared with some of the experimental results obtained
for the cases operating at the C-J condition. Next, the paper presents the extension of the one-dimensional theory to include
the oblique evaporation wave geometry. Relationships between upstream and downstream flow properties are discussed ant further
consequences of these relationships are analyzed.
Received 12 October 1999 / Accepted 21 March 2000 |
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Keywords: | : Evaporation wave Metastable liquid Evaporation Phase transition Liquid flashing |
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