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Two-phase flow friction at high void fraction in porous media with small particles and its impact on dryout heat flux evaluation

Title
Two-phase flow friction at high void fraction in porous media with small particles and its impact on dryout heat flux evaluation
Authors
Lee, M.Park, H.S.Park, J.H.Moriyama, K.Kim, M.H.
Date Issued
Sep-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
The effect of interfacial friction at a high void fraction on the estimation of the dryout heat flux (DHF) of particle beds under co-current two-phase flow conditions is investigated. The objective is to reduce uncertainties in the assessment of debris bed coolability during a severe accident in a light water reactor (LWR). A review of porous media air/water pressure drop experiments and friction models in the literature revealed that the existing models cannot adequately predict the interfacial friction at high void fraction. In this study, interfacial friction at high void fraction is suggested and corresponding modifications to the flow pattern map and other friction terms are presented. The proposed model shows an acceptable agreement with the experimental data of both the air/water two-phase pressure drop and DHF experimental results within the particle size range of 2-4 mm, similar to the average diameter of debris particles (2.5-3.5 mm, Hong and An, 2018) obtained from fuel coolant interaction tests. (C) 2019 Elsevier Ltd. All rights reserved.
URI
http://oasis.postech.ac.kr/handle/2014.oak/100187
ISSN
0301-9322
Article Type
Article
Citation
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, vol. 118, page. 75 - 86, 2019-09
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 KIM, MOO HWAN
Div. of Advanced Nuclear Enginrg
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