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RESEARCH PAPERS

A Comparative Numerical Study of Particle Mixing on Different Grate Designs Through the Discrete Element Method

[+] Author and Article Information
Harald Kruggel-Emden

Department of Energy Plant Technology (LEAT), Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germanykruggel-emden@leat.rub.de

Erdem Simsek

Department of Energy Plant Technology (LEAT), Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germanysimsek@leat.rub.de

Siegmar Wirtz

Department of Energy Plant Technology (LEAT), Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germanywirtz@leat.rub.de

Viktor Scherer

Department of Energy Plant Technology (LEAT), Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germanyscherer@leat.rub.de

J. Pressure Vessel Technol 129(4), 593-600 (Aug 18, 2006) (8 pages) doi:10.1115/1.2767338 History: Received March 13, 2006; Revised August 18, 2006

Based on LEAT’s discrete element codes, granular flow and mixing on conveying equipment are studied in two and three dimensions. Discrete element simulations, which are briefly introduced, provide detailed information on particle positions and velocities over time. This information is used to derive quantities characterizing the dynamic process of mixing. The main focus of the study presented is the mixing process of inhomogeneous particle ensembles on different grate types. For this purpose, the introduced mixing parameters are used to compare the mixing in a 3D situation with the corresponding 2D approximation on identical grates and to compare different grate designs in two dimensions.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometries of the grates: (a) forward acting grate 2D, (b) forward acting grate 3D, and (c) roller grate 2D

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Figure 2

Initial position of packed bed on forward acting grate

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Figure 3

Initial particle configuration (left) and configuration at t=800s (right) on forward acting grate

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Figure 4

Time-averaged horizontal, vertical, and total mixing parameters Pit(x), Pt(x) over the grate length

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Figure 5

Time-averaged mixing parameter Qt(x) over the grate length

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Figure 6

Mean normalized depth for different particle diameters

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Figure 7

Time-averaged vectorial and total mixing parameters Pit(x), Pt(x) over the grate length

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Figure 8

Time-averaged mixing parameter Qt(x) over the grate length

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Figure 9

Mean normalized depth for different particle diameters

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Figure 10

Initial position of packed bed on roller grate

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Figure 11

Initial particle configuration (left) and configuration at t=300s (right) on roller grate

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Figure 12

Time-averaged horizontal, vertical and total mixing parameters Pit(x), Pt(x) over the grate length

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Figure 13

Time-averaged mixing parameter Qt(x) over the grate length

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Figure 14

Mean normalized depth for different particle diameters

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