Study of natural circulation in a VHTR after a LOFA using different turbulence models

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yu-Hsin Tung
  • Yuh-Ming Ferng
  • Richard W. Johnson
  • Ching-Chang Chieng

Detail(s)

Original languageEnglish
Pages (from-to)206-217
Journal / PublicationNuclear Engineering and Design
Volume263
Online published29 May 2013
Publication statusPublished - Oct 2013

Abstract

Natural convection currents in the core are anticipated in the event of the failure of the gas circulator in a prismatic gas-cooled very high temperature reactor (VHTR). The paths that the helium coolant takes in forming natural circulation loops and the effective heat transport are of interest. The heated flow in the reactor core is turbulent during normal operating conditions and at the beginning of the LOFA with forced convection, but the flow may significantly be slowed down after the event and laminarized with mixed convection. In the present study, the potential occurrence and effective heat transport of natural circulation are demonstrated using computational fluid dynamic (CFD) calculations with different turbulence models as well as laminar flow. Validations and recommendation on turbulence model selection are conducted. The study concludes that large loop natural convection is formed due to the enhanced turbulence levels by the buoyancy effect and the turbulent regime near the interface of upper plenum and flow channels increases the flow resistance for channel flows entering upper plenum and thus less heat can be removed from the core than the prediction by laminar flow assumption. © 2013 Elsevier B.V. All rights reserved.

Citation Format(s)

Study of natural circulation in a VHTR after a LOFA using different turbulence models. / Tung, Yu-Hsin; Ferng, Yuh-Ming; Johnson, Richard W. et al.
In: Nuclear Engineering and Design, Vol. 263, 10.2013, p. 206-217.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review