A comprehensive, mechanistic heat transfer modeling package for dispersed flow film boiling - Part 1 - Development

Michael J. Meholic, David L. Aumiller, Fan Bill Cheung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Accurate predictions of Dispersed Flow Film Boiling (DFFB) heat transfer are necessary during both the blowdown and reflood portions of a Loss-of-Coolant-Accident to ensure the correct initial fuel rod temperature distribution for the beginning of the reflood phase and ultimately, determining the peak cladding temperature. Numerous correlative, phenomenological, and mechanistic DFFB heat transfer models have been published; however, most of these models make simplifying assumptions that adversely impact their accuracy or are too computationally intensive to implement into current reactor safety codes. A comprehensive, mechanistic heat transfer modeling package has been developed to account for the six interrelated heat transfer paths in DFFB. Highlights of the model include a Lagrangian subscale trajectory based dry contact heat transfer model and a novel method of determining the two-phase convective heat transfer enhancement due to dispersed droplets intermittently altering the local vapor temperature distribution.

Original languageEnglish (US)
Article number8378
Pages (from-to)295-301
Number of pages7
JournalNuclear Engineering and Design
Volume291
DOIs
StatePublished - Sep 1 2015

Fingerprint

film boiling
Boiling liquids
heat transfer
Heat transfer
modeling
Temperature distribution
temperature distribution
reactor safety
loss of coolant
Codes (standards)
Loss of coolant accidents
convective heat transfer
accidents
Heat conduction
temperature
rods
droplet
Vapors
accident
Trajectories

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Mechanical Engineering

Cite this

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abstract = "Accurate predictions of Dispersed Flow Film Boiling (DFFB) heat transfer are necessary during both the blowdown and reflood portions of a Loss-of-Coolant-Accident to ensure the correct initial fuel rod temperature distribution for the beginning of the reflood phase and ultimately, determining the peak cladding temperature. Numerous correlative, phenomenological, and mechanistic DFFB heat transfer models have been published; however, most of these models make simplifying assumptions that adversely impact their accuracy or are too computationally intensive to implement into current reactor safety codes. A comprehensive, mechanistic heat transfer modeling package has been developed to account for the six interrelated heat transfer paths in DFFB. Highlights of the model include a Lagrangian subscale trajectory based dry contact heat transfer model and a novel method of determining the two-phase convective heat transfer enhancement due to dispersed droplets intermittently altering the local vapor temperature distribution.",
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A comprehensive, mechanistic heat transfer modeling package for dispersed flow film boiling - Part 1 - Development. / Meholic, Michael J.; Aumiller, David L.; Cheung, Fan Bill.

In: Nuclear Engineering and Design, Vol. 291, 8378, 01.09.2015, p. 295-301.

Research output: Contribution to journalArticle

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