期刊
NUCLEAR ENGINEERING AND DESIGN
卷 264, 期 -, 页码 103-110出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.nucengdes.2013.07.002
关键词
Micro-hydrodynamics; CHF; DEPIcT
资金
- MIT Energy Initiative
- National R&D Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012M2B2A9A02029577]
- National Research Foundation of Korea [2012M2B2A9A02029577] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The wetted area fraction in subcooled pool boiling of water at atmospheric pressure is measured using the DEPIcT (DEtection of Phase by Infrared Thermography) technique. DEPIcT exploits the contrast in infrared (IR) light emissions between wet and dry areas on the surface of an IR-transparent heater to visualize the instantaneous distribution of the liquid and gas phases in contact with the heater surface. In this paper time-averaged wetted area fraction data in nucleate boiling are reported as functions of heat flux (from 30% up to 100% of the Critical Heat Flux) and subcooling (Delta T-sub = 0, 5, 10,30 and 50 degrees C). The results show that the wetted area fraction monotonically decreases with increasing heat flux and increases with increasing subcooling: both trends are expected. The range of time-averaged wetted area fractions is from 90%, at low heat flux and high subcooling, to 50% at high heat flux (right before CHF) and low subcooling. It is also shown that the dry areas are periodically rewetted by liquid sloshing on the surface at any subcooling and heat flux; however, the dry areas expand irreversibly at CHF. (C) 2013 Elsevier B.V. All rights reserved.
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