{"title":"Experimental and numerical analyses for boiling model selection and nonuniform void behavior at the onset of flow instability","authors":"","doi":"10.1016/j.anucene.2024.110840","DOIUrl":null,"url":null,"abstract":"<div><p>Numerical analyses were conducted to simulate the flow boiling phenomenon using different boiling models under natural circulation conditions. From the analyzed results, bubble behaviors were investigated at the onset of nucleate boiling (ONB) and the onset of flow instability (OFI). At the ONB, the predictions obtained for the bubble diameter, nucleation site density, and void fraction were compared with the experimental data. At the OFI, the bubble diameter, nucleation site density, void fraction, and bubble movement with respect to time were investigated. Among 4 cases with different combinations of boiling models, Case 1 was selected because the wall temperature, bubble diameter, nucleation site density, and void fraction were well predicted considering the agreement between the experimental and computational fluid dynamics results. When flow instability started as the heat flux increased, bubble behavior was nonuniform although heat flux was uniformly generated on the heated surface.</p></div>","PeriodicalId":8006,"journal":{"name":"Annals of Nuclear Energy","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annals of Nuclear Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306454924005036","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Numerical analyses were conducted to simulate the flow boiling phenomenon using different boiling models under natural circulation conditions. From the analyzed results, bubble behaviors were investigated at the onset of nucleate boiling (ONB) and the onset of flow instability (OFI). At the ONB, the predictions obtained for the bubble diameter, nucleation site density, and void fraction were compared with the experimental data. At the OFI, the bubble diameter, nucleation site density, void fraction, and bubble movement with respect to time were investigated. Among 4 cases with different combinations of boiling models, Case 1 was selected because the wall temperature, bubble diameter, nucleation site density, and void fraction were well predicted considering the agreement between the experimental and computational fluid dynamics results. When flow instability started as the heat flux increased, bubble behavior was nonuniform although heat flux was uniformly generated on the heated surface.
期刊介绍:
Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.