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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

EFECTS OF SURFACE CONDITION AND WORKING FLUID ON LIQUID FILM BREAKDOWN DURING HEAT TRANSFER

Get access (open in a dialog) DOI: 10.1615/IHTC8.1670
pages 1931-1936

Resumo

In this investigation an experimental study on film breakdown due to heating was made for a subcooled liquid film falling over the outside surface of horizontal test section. Tests were conducted using a 2.54 cm diameter electrically heated smooth copper tube and high-flux (HF)** tube as test sections. Distilled water and ethyl alcohol were used as working fluids. The combination of film flow rate and heat flux at which film breakdown occurs (i.e., dry patches appear on the surface) were determined. The results showed that the heat flux needed to course a dry patch depends on the surface condition and working fluid. It was also noted that the mechanism of film breakdown is efected by the nature of heated surface.