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Investigation of the critical heat flux in a rod bundle configuration under low pressure conditions

Kaiser, Florian; Gabriel, Stephan; Albrecht, Giancarlo; Wetzel, Thomas

Abstract (englisch):

Diverse boiling phenomena occur during the operation of light-water reactors. Their understanding is necessary to guarantee a safe service and to avoid unstable operating modes. For example, the comportment of the coolant could either be subcooled boiling during normal operation or even critical boiling during the occurrence of a disturbance. Besides, boiling effects also appear on the secondary loop of the steam generator.
The boiling process allows significantly higher heat transfer rates compared to the single-phase convection. But this heat transport can be suddenly decreased when the limit of the critical heat flux (CHF) is reached. The occurrence of the boiling crisis leads generally to severe damage of the facility components and has to be avoided during reactor operation. Until today, there is no reliable method predicting this phenomenon based on universally valid correlations. A substantial benefit for the reactor safety research would be a prediction method which is based on the solution of the transport equations for the two-phase flow of water and steam.
There exist many correlations based on observations in experiments or theoretical reflections which try to explain the occurrence and the development of the critical heat flux. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000084911
Veröffentlicht am 30.07.2018
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kern- und Energietechnik (IKET)
Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator ISBN: 978-3-7315-0753-6
ISSN: 1869-9669
KITopen-ID: 1000084911
HGF-Programm 32.02.02 (POF III, LK 01) Sicherheitsanalysen: Thermohydraulik
Erschienen in Ideen und Innovationen für die Energie von morgen : Wissenschaftliche Beiträge des KIT zu den Jahrestagungen 2014, 2016 und 2017 des KIT-Zentrums Energie. Ed.: W. Breh
Verlag KIT Scientific Publishing
Seiten 37-41
Serie KIT Scientific Reports ; 7747
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