Transient boiling of water under exponentially escalating heat inputs. Part I: Pool boiling
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Buongiorno_Transient boiling.pdf
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2.33 MB
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Author(s)
Su, Guanyu
Bucci, Matteo
Buongiorno, Jacopo
McKrell, Thomas J.
Date Issued
February 2016
Journal
International Journal of Heat and Mass Transfer
Publisher
Elsevier
Citation
Su, Guan-Yu et al. “Transient Boiling of Water Under Exponentially Escalating Heat Inputs. Part I: Pool Boiling.” International Journal of Heat and Mass Transfer 96 (May 2016): 667–684 © 2016 Elsevier Ltd
Version
Author's final manuscript
Abstract
This paper presents an investigation of transient pool boiling heat transfer phenomena in water at atmospheric pressure under exponentially escalating heat fluxes on plate-type heaters. Exponential power escalations with periods ranging from 5 to 100 ms, and subcooling of 0, 25 and 75 K were explored. What makes this study unique is the use of synchronized state-of-the-art diagnostics such as infrared (IR) thermometry and high-speed video HSV, which enabled accurate measurements and provided new and unique insight into the transient boiling heat transfer phenomena. The onset of nucleate boiling (ONB) conditions were identified. The experimental data suggest that ONB temperature and heat flux increase monotonically with decreasing period and increasing subcooling, in accordance with the predictions of a model based on transient conduction and a nucleation site activation criterion. Various boiling regimes were observed during the transition from ONB to fully developed nucleate boiling (FDNB). Onset of the boiling driven (OBD) heat transfer regime and overshoot (OV) conditions were identified, depending on the period of the power escalation and the subcooling. Forced convection effects have also been investigated and are discussed in the companion paper (Part II). Keywords: Exponential power escalation;
Heat transfer mechanisms; Infrared thermometry; High speed video;
Transient pool boiling
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.ijheatmasstransfer.2016.01.032
