Visualization of a principle mechanism of critical heat flux in pool boiling

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A new experimental work was made to discover a principle mechanism of the burnout in pool boiling. Here, we directly observed a liquid layer structure under a massive vapor clot and the liquid layer-related burnout phenomenon. Based on the present observations, we have made a visual model for the formation and dryout of a liquid film under its vapor environment. At the formation process, liquid is trapped in interleaved space between growing bubbles and surface and the liquid trapping continues between coalesced bubbles and surface. In the dryout process, we especially observed vapor "holes" made by spontaneous breakup of discrete nucleating bubbles inside a vapor clot. The burnout can be triggered by the evaporation of the liquid film region expanded from rims of the holes. (c) 2005 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2005-12
Language
English
Article Type
Article
Keywords

SURFACE; TEMPERATURE; FLUIDS; MODEL; WALL

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.48, no.25-26, pp.5371 - 5385

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2005.07.006
URI
http://hdl.handle.net/10203/3358
Appears in Collection
NE-Journal Papers(저널논문)
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