Table 7 The average velocities of coal particles in regions I, II, III, and IV.

From: Numerical simulation of coal particle motion characteristics in the envelope region of spiral drum based on discrete element method

Rotation speed/r min−1

Average velocity/m s−1

Region I

Region II

Region III

Region IV

4

X

1.290

0.313

− 0.059

0.411

Y

− 0.018

0.030

− 0.059

− 0.292

Z

− 1.102

− 1.961

− 0.095

− 0.089

5

X

1.538

0.296

− 0.068

0.520

Y

− 0.050

− 0.029

− 0.460

− 0.341

Z

− 1.131

− 1.819

− 0.133

− 0.074

6

X

1.657

0.451

− 0.066

0.589

Y

− 0.127

− 0.072

− 0.530

− 0.414

Z

− 1.131

− 1.925

− 0.165

− 0.087

7

X

1.804

0.383

− 0.078

0.681

Y

− 0.207

− 0.190

− 0.607

− 0.489

Z

− 1.157

− 1.962

− 0.116

− 0.064

8

X

1.931

0.417

− 0.088

0.749

Y

− 0.313

− 0.260

− 0.624

− 0.586

Z

− 1.174

− 2.022

− 0.035

− 0.019

9

X

2.028

0.093

− 0.132

0.829

Y

− 0.378

− 0.212

− 0.641

− 0.647

Z

− 1.175

− 2.096

0.111

0.042