Condensation Heat Transfer Characteristics of the Annular Two-Phase Closed Thermosyphon

Condensation Heat Transfer Characteristics of the Annular Two-Phase Closed Thermosyphon

Visual observations of flow patterns at the condenser and heat transfer measurements were conducted for heat transfer rate ranges of 18-1800W using a vertical annular device with various quantities of R113 as a working fluid. As a result of visual observations, it is shown that ripples (interfacial...

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Veröffentlicht in:Nihon Kikai Gakkai rombunshuu. B hen 1986/10/25, Vol.52(482), pp.3537-3544
Hauptverfasser: TAKUMA, Masao, MAEZAWA, Saburo, TSUCHIDA, Akira
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Sprache:eng ; jpn
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Vapor Drag
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container_issue 482
container_start_page 3537
container_title Nihon Kikai Gakkai rombunshuu. B hen
container_volume 52
creator TAKUMA, Masao
MAEZAWA, Saburo
TSUCHIDA, Akira
description Visual observations of flow patterns at the condenser and heat transfer measurements were conducted for heat transfer rate ranges of 18-1800W using a vertical annular device with various quantities of R113 as a working fluid. As a result of visual observations, it is shown that ripples (interfacial waves) are generated on the condensate film surface when the condensate film Reynolds number exceeds approximately 20, and the condensation heat transfer is promoted. A simple theoretical analysis was presented in which the effects of interfacial waves and vapor drag were considered. This analysis agreed very well with experimental results when the working fluid quantity was not so large that the two-phase mixture generated by boiling of the working fluid didn't reach the condenser. The effects of interfacial waves and vapor drag on condensation heat transfer were also investigated theoretically.
doi_str_mv 10.1299/kikaib.52.3537
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language eng ; jpn
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese
subjects Vapor Drag
title Condensation Heat Transfer Characteristics of the Annular Two-Phase Closed Thermosyphon
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