A zero-dimensional dryout heat flux model based on mechanistic interfacial friction models for two-phase flow regimes with channel flow in a packed bed

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dc.contributor.authorYeo, DYko
dc.contributor.authorNo, Hee-Cheonko
dc.date.accessioned2019-09-03T05:20:07Z-
dc.date.available2019-09-03T05:20:07Z-
dc.date.created2019-09-02-
dc.date.created2019-09-02-
dc.date.issued2019-10-
dc.identifier.citationINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.141, pp.554 - 568-
dc.identifier.issn0017-9310-
dc.identifier.urihttp://hdl.handle.net/10203/266604-
dc.description.abstractIn this paper, two-phase drag models for a packed bed of uniform-size particles were suggested, and they were applied to the calculation of pressure drop and dryout heat flux. We provided physical basis for the two-phase flow regime model through the analysis of the interfacial friction (F-i). The suggested model provides flow patterns representing bubbly, slug, and channel flow and considering three criteria including d(2)F(i)/d alpha(2) = 0, F-i = maximum, and F-i = 0. The results obtained from the three criteria were drawn with several observation-based experimental ones to generate the flow regime map (void fraction vs. particle diameter). Through the current flow regime map, we clearly saw the existence of channel flow in a packed bed with particles smaller than around 3.5 mm. Then, mechanistic interfacial friction models were developed on basis of the current two-phase flow map of bubbly flow, slug flow, channel flow and annular flow. The suggested interfacial friction models were validated with top- and bottom-flooding air-water experiments and boiling experiments. We found out that the capability of pressure drop estimation by the current model were significantly improved for a bed with small particles. Finally, a zero-dimensional dryout heat flux (DHF) model was derived using the suggested interfacial friction models, and validated against DHF experimental data for beds with 1-D configuration. The rootmean-square error (RMSE) of the suggested DHF model was 35%, which was the smallest among the RMSEs of the previous DHF models. (C) 2019 Elsevier Ltd. All rights reserved.-
dc.languageEnglish-
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD-
dc.titleA zero-dimensional dryout heat flux model based on mechanistic interfacial friction models for two-phase flow regimes with channel flow in a packed bed-
dc.typeArticle-
dc.identifier.wosid000480665000047-
dc.identifier.scopusid2-s2.0-85068386957-
dc.type.rimsART-
dc.citation.volume141-
dc.citation.beginningpage554-
dc.citation.endingpage568-
dc.citation.publicationnameINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER-
dc.identifier.doi10.1016/j.ijheatmasstransfer.2019.06.096-
dc.contributor.localauthorNo, Hee-Cheon-
dc.contributor.nonIdAuthorYeo, DY-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorPorous media-
dc.subject.keywordAuthorTwo-phase flow-
dc.subject.keywordAuthorInterfacial friction-
dc.subject.keywordAuthorDryout heat flux-
dc.subject.keywordAuthorChannel flow-
dc.subject.keywordPlusPRESSURE-DROP-
dc.subject.keywordPlusDEBRIS BED-
dc.subject.keywordPlusDRAG-
dc.subject.keywordPlusCOOLABILITY-
dc.subject.keywordPlusCORE-
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