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On the Relation between Nucleation Site Density and Critical Heat Flux of Pool Boiling
China Univ Petr, Beijing Key Lab Proc Fluid Filtrat & Separat, Beijing, Peoples R China.;KTH, Dept Phys, Stockholm, Sweden..
Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China..
Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian, Shaanxi, Peoples R China..
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2018 (English)In: Heat Transfer Engineering, ISSN 0145-7632, E-ISSN 1521-0537, Vol. 39, no 17-18, p. 1498-1506Article in journal (Refereed) Published
Abstract [en]

It is traditionally accepted that the critical heat flux (CHF) decreases with increasing nucleation site density (NSD). However, such a CHF-NSD relation was no longer observed in the BETA-B experiment performed on nano-film heaters; instead the increase of NSD resulted in a gain in CHF. To address this seeming contradiction in the relation between critical heat flux and nucleation site density, the present work employed probabilistic analysis to reveal the different tendencies. A concept of effective NSD was proposed, which concerns the active nucleation sites appear within a bubble lifetime, and the resulting bubbles have the chance of direct interaction. We assumed that the boiling crisis on a heater surface is mainly induced by two mechanisms: dry spot expanding in isolated bubble regime for low-NSD surface, coalescence of dry spots under multiple bubbles in fully developed nucleate boiling regime for high-NSD surface, or a combination of the two in the transition regime for medium-NSD surface. Accordingly, we estimated the critical heat flux of each boiling regime at which the boiling crisis occurs. The result indicated that there is a threshold of nucleation site density below which the increase of NSD is contributing to CHF enhancement, while the trend is inverted beyond the threshold.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS INC , 2018. Vol. 39, no 17-18, p. 1498-1506
Keywords [en]
LVALLE VH, 1985, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, V28, P1907 biki T, 2003, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, V46, P2587
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-241339DOI: 10.1080/01457632.2017.1369836ISI: 000454828600003Scopus ID: 2-s2.0-85029603984OAI: oai:DiVA.org:kth-241339DiVA, id: diva2:1280799
Conference
5th International Symposium on Heat Transfer and Energy Conservation (ISHTEC), NOV 11-14, 2016, Guangzhou, PEOPLES R CHINA
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved

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