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Three-dimensional simulation of turbulent flow in 3-sub channels of a VVER-1000 reactor

Ganjiani, H ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. In this study, the fluid dynamics and convective heat transfer for turbulent flows through a 3-sub channel of a rod bundle, which is representative of those used in VVER-1000, are examined. The rod bundle is constructed from parallel rods in a hexagonal array. The rods are on constant pitch by spacer grids spaced axially along the rod bundle. The geometry details of the bundle and heat flux from the fuel rod are similar to that of the Iranian nuclear reactor under construction. A numerical study using Computational Fluid Dynamics (CFD) was carried out to estimate the flow field, pressure loss and heat transfer coefficients in spacer grids and rod bundles. Turbulence has been modeled using the k - ε turbulence model. At a distance of 2Dh from the beginning of the spacer grids, in the direction of flow, because fluid enthalpy and Nusselt numbers have maximum and minimum values, respectively, the probability of nucleate boiling (PNB) is much higher, and a two phase flow will occur. Predicted results are found to be in close agreement with those of the experimental results reported in the literature
  5. Keywords:
  6. Computational fluid dynamics (CFD) ; Rod bundle ; Convective heat transfer ; Fuel rods ; Hexagonal arrays ; Minimum value ; Numerical studies ; Pressure loss ; Rod bundles ; Spacer grid ; Sub channel ; Subchannels ; Three dimensional simulations ; VVER-1000 reactor ; Fluid dynamics ; Fluids ; Heat exchangers ; Nuclear propulsion ; Nucleate boiling ; Nusselt number ; Three dimensional computer graphics ; Turbulence models ; Turbulent flow ; Two phase flow ; Channel flow ; Computational fluid dynamics ; Convection ; Flow field ; Heat transfer ; Nuclear power plant ; Three-dimensional modeling ; Turbulent flow
  7. Source: Scientia Iranica ; Volume 17, Issue 2 B , 2010 , Pages 83-92 ; 10263098 (ISSN)
  8. URL: http://archive.scientiairanica.com/PDF/Articles/00001259/firoozabadi.pdf