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Research Papers: Nuclear Power

Development of a Hybrid Turbulent Particle Dispersion Model and Implementation in the Gasflow Code

[+] Author and Article Information
Zhanjie Xu1

 Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germanyzhanjie.xu@iket.fzk.de Ingenieurbüro DuBois-Pitzer-Travis, 63071 Offenbach, Germanyzhanjie.xu@iket.fzk.de Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germanyzhanjie.xu@iket.fzk.de

John R. Travis, Wolfgang Breitung

 Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany Ingenieurbüro DuBois-Pitzer-Travis, 63071 Offenbach, Germany Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany

1

Corresponding author.

J. Eng. Gas Turbines Power 131(1), 012908 (Oct 02, 2008) (6 pages) doi:10.1115/1.2983142 History: Received July 28, 2008; Revised July 29, 2008; Published October 02, 2008

Dust mobilization in a vacuum vessel is one of the key issues endangering the security of the International Thermonuclear Experimental Reactor (ITER) in case of loss of vacuum accidents. The turbulent behavior of particles in turbulent flows has to be modeled for successful numerical simulations about particle mobilization. In this study a Lagrangian approach is adopted to formulate the particle transport especially for dust-dilute flows mostly encountered in the vacuum vessel of ITER. Based on the logic frame of the approach and the used computational fluid dynamics (CFD) computer code in the study, a hybrid turbulent particle dispersion model is proposed. The hybrid model features both a deterministic separated flow model and a stochastic separated flow (SSF) model, which are two popular turbulent dispersion models applied in particle simulations, and takes the advantages of the both models. The proposed model is implemented into the particle model of the CFD code successfully and the simulation results are verified against the experimental data. The verifications manifest the validities of the proposed model. In this paper general information about the work of dust mobilization is introduced and the particle turbulent dispersion models are reviewed briefly at first. The hybrid model is then proposed based on the SSF model. An experiment about particle dispersions in an advective wind channel flow with decaying turbulence in the streamwise direction is reviewed in the third section. In the following section about model verification, the decaying turbulence parameters in the channel flow are verified against the experimental data as the first step, and the parameters about the particle dispersions in the verified flow field are then verified against the data. The work is concluded finally.

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Figures

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Figure 7

Comparison of the data and simulation with the hybrid model on particle dispersion distance in the y-direction in case of a large particle

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Figure 8

Comparison of the data and simulation with the hybrid model on particle dispersion velocity in the y-direction in case of a large particle

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Figure 9

Comparison of the instantaneous velocity fluctuations of fluid, small particles, and large particles

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Figure 1

Particle eddy interactions

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Figure 2

Wells and Stock’s experiment on particle dispersion in grid-generated decaying turbulent advective flow

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Figure 3

Verification of the numerical solution against the analytical solution and the experimental data of U2∕ug′2×0.01

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Figure 4

Verification of the numerical solution against the analytical solution and the experimental data of ε

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Figure 5

Comparison of the data and simulation with the hybrid model on particle dispersion distance in the y-direction in case of a small particle

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Figure 6

Comparison of the data and simulation with the hybrid model on particle dispersion velocity in the y-direction in case of a small particle

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