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Research Papers: Nuclear Power

Implementation of a Pressure Drop Model for the CFD Simulation of Clogged Containment Sump Strainers

[+] Author and Article Information
Alexander Grahn1

Institut für Sicherheitsforschung, Forschungszentrum Dresden-Rossendorf e. V., 01314 Dresden, Germanya.grahn@fzd.de

Eckhard Krepper, Frank-Peter Weiß

Institut für Sicherheitsforschung, Forschungszentrum Dresden-Rossendorf e. V., 01314 Dresden, Germany

Sören Alt, Wolfgang Kästner, Alexander Kratzsch, Rainer Hampel

Institut für Prozesstechnik, Prozessautomatisierung und Messtechnik, Hochschule Zittau-Görlitz, University of Applied Sciences, 02754 Zittau, Germany

1

Corresponding author.

J. Eng. Gas Turbines Power 132(8), 082902 (May 28, 2010) (9 pages) doi:10.1115/1.4000365 History: Received July 22, 2009; Revised August 19, 2009; Published May 28, 2010; Online May 28, 2010

The present study aims at modeling the pressure drop of flows through growing cakes of compressible fibrous materials, which may form on the upstream side of containment sump strainers after a loss-of-coolant accident. The model developed is based on the coupled solution of a differential equation for the change of the pressure drop in terms of superficial liquid velocity and local porosity of the fiber cake and a material equation that accounts for the compaction pressure dependent cake porosity. Details of its implementation into a general-purpose three-dimensional computational fluid dynamics code are given. An extension to this basic model is presented, which simulates the time dependent clogging of the fiber cake due to capturing of suspended particles as they pass trough the cake. The extended model relies on empirical relations, which model the change of pressure drop and removal efficiency in terms of particle deposit in the fiber cake.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Fiber cake at a strainer

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Figure 2

(a) compaction measurement principle; (b) typical compaction curve ε(pk)

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Figure 3

Measured relationship of compaction pressure pk and porosity ε for given samples of mineral wool

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Figure 4

Clogged fiber bed element in uncompressed and compressed states

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Figure 5

Fiber cake build-up; profiles of (a) compaction pressure, (b) porosity; (c) development of pressure drop; u=4 cm s−1, ζf=0.001

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Figure 6

Profiles of (a) compaction pressure and (b) porosity at given strainer mass load (Nf=10 kg m−2) for different superficial velocities U

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Figure 7

Test rig for pressure drop measurements

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Figure 8

Calculated and experimentally determined pressure drop-superficial velocity relationship at different temperatures, Nf=5.41 kg m−2

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Figure 9

Fiber cake clogging; profiles of (a) compaction pressure, (b) porosity, (c) suspended particle concentration, and (d) specific deposit; U=2 cm s−1, Nf=10 kg m−2, ζp,up=0.0001, bλ=100, bF1=200, and bF2=20

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Figure 10

Strainer represented as CFX subdomain

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Figure 11

Flow field (streamlines) in the channel mid plane; (a) t=0 s and (b) t=40 s

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