Impact of spacer on inter sub-channel mixing of coolant in nuclear fuel bundle: a survey and future patterns of research and advances
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S. K. Verma
Abstract
Broad efforts have been ended in the last decade for the development of spacer and its effect on droplets that present in the vapour core. The spacers operate as droplet collectors and accumulate considerable amount of the droplet flux in an emblematic spacer section. This development paved the way for engineers and researchers to come up with spacer that exhibit better inter subchannel mixing in the reactor. The review is based on the correlation developed by different researchers for the spacer modelling, grey areas and challenges for further improvement in the prediction and some of the good models have been recommended. The effect of spacer on liquid films and droplet depositions before spacer and near spacer have been studied and finally based on this investigation a proposed LDV measurement techniques have been applied on 1/12th segment of Advanced Heavy Water Reactor for further analysis of spacer effect on annular flow. Efforts are made to uncover the investigated gaps from the precedent literatures, as an effect of which it is concluded that there is extremely inadequate work published in the field of thermal-hydraulics incorporating spacer effect such as turbulent mixing, droplet deposition and liquid film thickness in the case of AHWR.
Kurzfassung
In den letzten zehn Jahren wurden die Arbeiten zur Entwicklung von Abstandhaltern und deren Wirkung auf die im Dampfkern vorhandenen Tröpfchen beendet. Abstandhalter arbeiten als Tropfenabscheider und sammeln einen beträchtlichen Teil des Tropfenflusses innerhalb des betrachteten Abschnitts eines Abstandhalters. Darauf aufbauend werden seitdem Abstandhalter entwickelt, die zu einer besseren Vermischung in den Unterkanälen von Brennelementen führen. Dieser Beitrag basiert auf den entwickelten Korrelationen zur Abstandhaltermodellierung und beschreibt deren offenen Fragestellungen sowie die Herausforderungen für weitere Verbesserungen. Dabei wird insbesondere der Einfluss der Abstandshalter auf flüssige Filme und Tröpfchenablagerungen vor und in der Nähe der Abstandshalter untersucht. Auf der Grundlage dieser Untersuchung wird LDV-Messtechnik vorgeschlagen, die an einem 1/12-Segment eines Advanced-Heavy-Water-Reactor-Modells aufgebaut wurde. Eine begleitende Literaturrecherche zeigt, dass der Einfluss von AHWR-Abstandshaltern auf Effekte wie turbulentes Mischen, Tröpfchenabscheidung und Flüssigkeitsschichtdicke noch weitgehend unzureichend untersucht sind.
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© 2018, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Technical Contributions/Fachbeiträge
- Reactor safety research within the Helmholtz Association
- Analysis of the impact of different scenarios on the simulation results of unauthorized dilution of boric acid in the coolant of the primary circuit of the NPP-2006
- Assessment of void fraction predictability of system codes in subchannels
- Review on using nanofluids for heat transfer enhancement in nuclear power plants
- Analysis of operating characteristics of IPWR under natural circulation
- Impact of spacer on inter sub-channel mixing of coolant in nuclear fuel bundle: a survey and future patterns of research and advances
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Technical Contributions/Fachbeiträge
- Reactor safety research within the Helmholtz Association
- Analysis of the impact of different scenarios on the simulation results of unauthorized dilution of boric acid in the coolant of the primary circuit of the NPP-2006
- Assessment of void fraction predictability of system codes in subchannels
- Review on using nanofluids for heat transfer enhancement in nuclear power plants
- Analysis of operating characteristics of IPWR under natural circulation
- Impact of spacer on inter sub-channel mixing of coolant in nuclear fuel bundle: a survey and future patterns of research and advances