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Conjugate transient natural convection in a cylindrical enclosure with internal volumetric heat generation
Published in
2008
Volume: 35
   
Issue: 8
Pages: 1502 - 1514
Abstract
This paper reports the results of a numerical investigation of transient turbulent natural convection heat transfer from a volumetric energy generating source placed inside a cylindrical enclosure filled with low Prandtl number fluid (liquid sodium, Pr = 0.005). Two-dimensional conservation equations of mass, momentum and energy, coupled with the Boussinesq approximation, are solved using a finite volume based discretisation method employing the SIMPLE algorithm for the pressure velocity coupling. Turbulence is modeled using the k-ε model with physical boundary conditions. The study presents the transient features of confined turbulent natural convection, due to time varying generation of heat in the volumetric source. The intensity of heat source exponentially decays with time and the source is placed over circular plates with a central opening. Results obtained from the numerical model compare favorably with those reported in the literature for steady state natural convection. Numerical simulations are carried out to display the sequential evolution of flow and thermal fields and the maximum temperature reached in the source. The advantages of distributing the heat source on multi trays have been quantified. © 2008 Elsevier Ltd. All rights reserved.
About the journal
JournalAnnals of Nuclear Energy
ISSN03064549
Open AccessNo
Concepts (50)
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    Alkali metals
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    Approximation algorithms
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    Boundary conditions
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    Boundary value problems
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    Computer simulation
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    Electric field effects
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    Enclosures
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    Evolutionary algorithms
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    Finite volume method
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    FLUID DYNAMICS
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    FLUID MECHANICS
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    Fluidics
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    FLUIDS
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    Heat convection
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    Integer programming
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    Liquid metals
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    Mathematical models
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    Natural convection
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    Plates (structural components)
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    Power generation
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    Sodium
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    Turbulence
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    Turbulence models
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    Two dimensional
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    (i ,j) conditions
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    (R ,S)-CONJUGATE
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    BOUSSINESQ APPROXIMATIONS
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    Circular plates
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    Conservation equations
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    CYLINDRICAL ENCLOSURES
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    DISCRETISATION METHOD
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    ELSEVIER (CO)
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    Evolution (co)
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    FINITE VOLUMES
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    HEAT SOURCING
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    LIQUID SODIUM
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    LOW PRANDTL NUMBER FLUIDS
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    Maximum temperature
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    Numerical investigations
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    Numerical modelling
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    Numerical simulations
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    PRESSURE VELOCITY COUPLINGS
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    SIMPLE ALGORITHMS
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    STEADY-STATE NATURAL CONVECTION
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    Time varying
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    TURBULENT NATURAL CONVECTION
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    Two-dimensional (2d)
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    VOLUMETRIC ENERGY
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    Volumetric heat generation
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    Numerical methods