Simultaneous visualization of dry spots and bubbles for pool boiling of R-113 on a horizontal heater

A new experimental attempt was made to simultaneously observe the dynamic behaviors of bubbles and dry spots in the vicinity of boiling surface. Also, the two-dimensional bubble structures were obtained separately. From the visualization results, the formation of bubbles and dry spots occurs simulta...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2003-06, Vol.46 (12), p.2239-2251
Main Authors: Chung, Heung June, No, Hee Cheon
Format: Article
Language:English
Subjects:
Applied sciences
Bubble
Dry spot
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Locally limited nucleate boiling activity
Refrigerants
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
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Summary:A new experimental attempt was made to simultaneously observe the dynamic behaviors of bubbles and dry spots in the vicinity of boiling surface. Also, the two-dimensional bubble structures were obtained separately. From the visualization results, the formation of bubbles and dry spots occurs simultaneously. At critical heat flux (CHF), the surface rewetting is repeated by the local nucleate boiling around the large vapor film. At just after CHF, nucleate boiling at the locally wetted region is extinguished, resulting in the dryout of the whole heater surface. Therefore, we conclude that CHF is initiated from the locally limited nucleate boiling activity rather than any hydrodynamic instability.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(02)00524-0