A comparison of flow field characteristics from PIV experiment measurement to numerical simulation behind a spacer in a vertical pipe
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Date issued
2010
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Publisher
University of West Bohemia
Abstract
This paper describes the topic of measurement using a modern laser method (PIV) in an annular channel of very
small dimensions. The annular channel simulates the flow area around a model of a fuel rod in the VVER nuclear
reactor. The annular channel holds spacers which create obstacles to fluid flow. The spacers serve a number
of important purposes. In the real nuclear reactor, the spacer holds a fuel rod in the fuel rod bundle. Another
important function of the spacer is to influence the flow field characteristics, especially turbulence size, by the
shape of the spacer. The value of the turbulence regulates the intensity of heat transfer between the fuel rod and
the fluid. Therefore, it is very important to provide a correct description and analysis of the flow field behind
the obstacle the spacer generates. The paper further looks into the solution of the same task using numerical
simulation. The solution of this task consisted of setting the suitable boundary conditions and of setting the
turbulence model for the numerical simulation. The result is a comparison of the flow field characteristics from
the experimental measurement and the findings of the numerical simulation. The numerical simulation was carried
out using commercial CFD software package, FLUENT.
Description
Subject(s)
laserová anemometrie, integrální laserová anemometrie, numerická simulace, vertikální anulární trubice, FLUENT
Citation
Applied and Computational Mechanics. 2010, vol. 4, no. 1, p. 57-66.