A mechanistic model for nucleate pool boiling including the effect of bubble coalescence on area fractions

Cited 1 time in webofscience Cited 0 time in scopus
  • Hit : 49
  • Download : 0
A mechanistic model that includes the effect of the bubble coalescence on nucleate pool boiling heat transfer is developed through experimental and theoretical investigations. Transient temperature and heat flux distributions on the boiling surface are obtained using a high-speed infrared imaging technique. According to the temperature and heat flux distributions, the boiling surface is classified into three regions: natural convection, quenching, and evaporation regions. By observing how the heat flux on each region and the corresponding area fraction change as the bubble coalescence occurs, the effect of the bubble coalescence on nucleate pool boiling is investigated. It is found that the bubble coalescence does not affect the heat fluxes on the three regions but affects the area fractions: As the bubble coalescence occurs, the rates of increase in quenching and evaporation area fractions with respect to the wall superheat decrease, while the natural convection area fraction remains the same. By accounting for the effect of the bubble coalescence on quenching and evaporation area fractions, a new correlation of the boiling heat flux is developed and presented. To validate the proposed model, boiling curves for saturated water and FC-72 are reproduced and compared to experimental data. The most distinguishing feature of the model is that it accurately predicts the rate of change of the heat flux with respect to the wall superheat as well as the location of the inflection point at which the slope of the boiling curve begins to decrease. As a result, the error between the reproduced boiling curve and experimental data is reduced by 94% compared to the previous model, which does not include the effect of the bubble coalescence for both water and FC-72.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2020-12
Language
English
Article Type
Article
Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.163, pp.120453

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2020.120453
URI
http://hdl.handle.net/10203/278955
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 1 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0