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Thermal Analysis of a Solar External Receiver Tube with a Novel Component of Guide Vanes

Tu, Zecan 1; Piccioni Koch, Daniela 1; Sarunac, Nenad; Frank, Martin 1; Mao, Junkui
1 Steinbuch Centre for Computing (SCC), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The heat transfer performance of a solar external receiver tube with guide vanes was numerically studied under non-uniform heat flux conditions. Models of the smooth tube and the tube with guide vanes were built. The distributions of the temperature, velocity, turbulence intensity, and Nu predicted by these two models were compared to investigate the heat transfer enhancement and the mixing effect of the guide vanes. The effect of the Re and the α on the heat transfer enhancement was also studied. The results show that the guide vanes form spiraling flows, reduce the maximum tube and molten salt temperatures, and improve the heat transfer. In addition, a more uniform temperature distribution is achieved compared to the smooth tube, allowing the molten salt to work safely under higher heat flux conditions in the receiver tube with guide vanes. It was observed that a larger Re enhances the heat transfer on the tube wall and achieves a longer effective distance of enhanced heat transfer in the downstream region, while the spiraling flow, the heat transfer enhancement, and the mixing are stronger for a larger α


Verlagsausgabe §
DOI: 10.5445/IR/1000133814
Veröffentlicht am 11.06.2021
Originalveröffentlichung
DOI: 10.3390/en14082253
Scopus
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Steinbuch Centre for Computing (SCC)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 16.04.2021
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000133814
HGF-Programm 46.21.01 (POF IV, LK 01) Domain-Specific Simulation & SDLs and Research Groups
Erschienen in Energies
Verlag MDPI
Band 14
Heft 8
Seiten Article no: 2253
Vorab online veröffentlicht am 02.04.2021
Schlagwörter solar power tower; external receiver; guide vane; molten salt; heat transfer
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