Title of article :
Discrete element simulations of a high-shear mixer
Author/Authors :
H.P. Kuo، نويسنده , , P.C. Knight، نويسنده , , D.J. Parker، نويسنده , , M.J. Adams، نويسنده , , J.P.K. Seville، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
13
From page :
297
To page :
309
Abstract :
Particle motion in a vertical-axis mixer was studied using discrete element method (DEM) simulations and positron emission particle tracking experiments. The mixer was fixed with a circular disk rotating in a horizontal plane or a simple paddle. In the DEM simulations, linear springs, dashpots and frictional sliders were used to model the contact mechanics between the particles and the particles and the walls. Quantitative comparisons were made between the numerical calculations and the experimental measurements. The DEM prediction captures the major features of the flow patterns in the mixer when the mixer was fixed with a disk impeller rotating at 100 r.p.m., although the predicted particle velocities are higher than experimental measurements when using physically reasonable simulation parameters (normal stiffness = 1000 and 10000 N/m; coefficient of restitution = 0.9; internal friction coefficient = 0.2, 0.3 and 0.45; wall friction coefficient = 0.2, 0.25 and 0.3). However, when the mixer was fixed with the paddle impeller, the calculated results using physically reasonable simulation parameters were different from the measurements. The calculated particle velocity was as high as 2 m/s, while the averaged particle velocity from measurement was about 0.1 m/s.
Keywords :
Vertical mixer , positron emission particle tracking , simulation validation , Discrete element method
Journal title :
Advanced Powder Technology
Serial Year :
2004
Journal title :
Advanced Powder Technology
Record number :
1247223
Link To Document :
بازگشت