{"title":"Experimental study of the effect of surface roughness on the heat transfer characteristics of subcooled flow boiling in a narrow rectangular channel","authors":"","doi":"10.1016/j.anucene.2024.110842","DOIUrl":null,"url":null,"abstract":"<div><p>Due to the size limitation, the heat transfer characteristics of subcooled flow boiling in the narrow rectangular channel are different from the conventional channels. Surface roughness directly affects bubble formation and detachment in subcooled boiling. This study presents a visualization study on the effect of surface roughness on the heat transfer characteristics and the onset of nucleate boiling (ONB) in narrow rectangular channels, including roughness of 0.34 μm, 1.2 μm, and 2.5 μm. The results indicate that surface roughness can enhance the heat transfer between the fluid and the wall and reduce wall temperature. The heat transfer coefficient in the subcooled flow boiling increases nonlinearly with surface roughness. Large surface roughness can shift the axial position of the ONB forward and reduce the wall heat flux required for subcooled flow boiling. An empirical correlation for predicting the subcooled flow boiling is modified based on Hsu’s nucleation criterion and the experimental data.</p></div>","PeriodicalId":8006,"journal":{"name":"Annals of Nuclear Energy","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-08-17","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/S030645492400505X","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
Due to the size limitation, the heat transfer characteristics of subcooled flow boiling in the narrow rectangular channel are different from the conventional channels. Surface roughness directly affects bubble formation and detachment in subcooled boiling. This study presents a visualization study on the effect of surface roughness on the heat transfer characteristics and the onset of nucleate boiling (ONB) in narrow rectangular channels, including roughness of 0.34 μm, 1.2 μm, and 2.5 μm. The results indicate that surface roughness can enhance the heat transfer between the fluid and the wall and reduce wall temperature. The heat transfer coefficient in the subcooled flow boiling increases nonlinearly with surface roughness. Large surface roughness can shift the axial position of the ONB forward and reduce the wall heat flux required for subcooled flow boiling. An empirical correlation for predicting the subcooled flow boiling is modified based on Hsu’s nucleation criterion and the experimental data.
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.