Strona 2_redak - Instytut Agrofizyki im. Bohdana Dobrzańskiego ...

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16.5. Angle of internal friction, cohesion, flow index, and angle of repose
Table 16.26. Mean values (±St. Dev.) of the angle of internal friction ϕ, the cohesion c and the
angle of natural repose - of cereal grain at the moisture content of 10-20%
Material
Wheat
Begra
Rye
Amilo
Barley
Rudnik
Corn
Mieszko
Oats
Borowiak
Triticale
Fidelio
Moisture
content
(%)
10
12.5
15
17.5
20
10
12.5
15
17.5
20
10
12.5
15
17.5
20
10
12.5
15
17.5
20
10
12.5
15
17.5
20
10
12.5
15
17.5
20
Angle of internal
friction
ϕ (deg)
25.7 ± 0.3
26.2 ± 0.4
27.0 ± 0.5
33.0 ± 1.0
35.5 ± 0.5
23.0 ± 1.0
24.4 ± 1.1
25.1 ± 0.5
28.4 ± 1.2
28.0 ± 1.0
27.8 ± 0.4
28.5 ± 0.5
31.2 ± 0.3
30.6 ± 1.0
33.2 v 0.5
26.7 ± 0.6
31.7 ± 0.5
32.0 ± 1.4
33.4 ± 0.8
33.6 ± 1.5
22.1 ± 1.1
22.4 ± 0.9
24.0 ± 0.5
23.9 ± 1.0
26.4 ± 1.7
23.6 ± 0.7
23.0 ± 1.2
25.3 ± 1.1
28.8 ± 1.2
28.4 ± 1.2
Cohesion
c (kPa)
0.9 ± 0.5
2.8 ± 0.5
2.1 ± 0.7
5.1 ± 0.5
2.3 ± 0.9
6.2 ± 1.4
6.6 ± 1.5
4.7 ± 0.7
3.2 ± 1.4
7.7 ± 1.4
3.6 ± 0.6
4.7 ± 0.8
3.9 ± 0.4
2.9 ± 0.5
5.5 ± 0.7
3.4 ± 0.9
6.1 ± 0.9
5.6 ± 1.8
5.9 ± 1.1
8.8 ± 1.6
0.4 ± 1.4
1.1 ± 1.3
2.2 ± 0.6
4.0 ± 1.1
6.5 ± 2.0
5.7 ± 1.0
9.4 ± 1.6
12.1 ± 1.3
10.7 ± 1.5
11.1 ± 1.8
Angle of natural
repose
- (deg)
24.3 ± 0.5
29.0 ± 0.7
33.3 ± 0.6
37.6 ± 0.5
35.4 ± 0.4
29.0 ± 0.6
27.1 ± 0.5
31.4 ± 0.2
29.9 ± 0.3
30.3 ± 0.2
26.8 ± 0.7
28.9 ± 0.7
29.5 ± 0.7
30.5 ± 0.8
32.1 ± 0.8
23.5 ± 0.4
33.8 ± 0.2
30.6 ± 0.3
34.2 ± 0.5
31.9 ± 0.6
28.4 ± 0.4
28.7 ± 1.0
31.3 ± 0.5
32.8 ± 0.5
34.7 ± 0.4
29.9 ± 0.4
28.4 ± 0.2
30.5 ± 0.1
35.4 ± 0.2
38.3 ± 0.2