Onset of flow reversal in upflow condensation in an inclinable tube
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- 作者：Jader R. Barbosa Jr. ; jrb@polo.ufsc.br" class="auth_mail" title="E-mail the corresponding author ; Jú ; lio C.A. Ferreira ; Daniel Hense
- 关键词：Flow reversal ; Upflow condensation ; Annular flow ; Waves ; Flow patterns ; Image analysis
- 刊名：Experimental Thermal and Fluid Science
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：77
- 期：Complete
- 页码：55-70
- 全文大小：5537 K
文摘
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Analysis of R-134a condensation in a 5-mm glass tube inclined at 30°, 60° and 90°.
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Flow reversal was well predicted by the Wallis correlation with modified constants.
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LED-based method produced time-resolved data of film thickness and wave parameters.
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The wave structure was similar to that observed in isothermal annular flows.
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The wave frequency increased and the velocity decreased with the condensation rate.