Condensation heat transfer characteristics of the annular two-phase closed thermosyphon

Autor:	Saburo Maezawa, Masao Takuma, Akira Tsuchida
Rok vydání:	1986
Předmět:	Condensed Matter::Quantum Gases Materials science Convective heat transfer Critical heat flux Mechanical Engineering Thermodynamics Heat transfer coefficient Condensed Matter Physics Churchill–Bernstein equation Physics::Fluid Dynamics Drag Heat transfer Thermosiphon Condenser (heat transfer)
Zdroj:	TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B. 52:3537-3544
ISSN:	1884-8346 0387-5016
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ec9cd4eae011a452a0f45ce865cb50ec https://doi.org/10.1299/kikaib.52.3537 Zobrazit plný text záznamu