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

141
16.6. Pressure ratio
Table 16.30. Mean values (±St. Dev.) of the pressure ratio k s and k 3 and the angle of internal friction ϕ
of cereal grain at the moisture content of 10-20%
Material
Moisture
content (%)
k s
k 3 = 1.1(1–sinϕ)
Angle of internal
friction ϕ (deg)
Wheat
Begra
10
12.5
15
17.5
20
0.44 ± 0.02
0.38 ± 0.01
0.34 ± 0.02
0.31 ± 0.02
0.35 ± 0.01
0.62 ± 0.01
0.61 ± 0.01
0.60 ± 0.01
0.50 ± 0.02
0.46 ± 0.01
25.7 ± 0.3
26.2 ± 0.4
27.0 ± 0.5
33.0 ± 1.0
35.5 ± 0.5
Rye
Amilo
10
12.5
15
17.5
20
0.52 ± 0.01
0.51 ± 0.04
0.47 ± 0.06
0.37 ± 0.04
0.32 ± 0.05
0.67 ± 0.02
0.64 ± 0.02
0.63 ± 0.02
0.58 ± 0.02
0.58 ± 0.02
23.0 ± 1.0
24.4 ± 1.1
25.1 ± 0.5
28.4 ± 1.2
28.0 ± 1.0
Barley
Rudnik
10
12.5
15
17.5
20
0.45 ± 0.02
0.47 ± 0.03
0.43 ± 0.02
0.45 ± 0.03
0.39 ± 0.03
0.59 ± 0.01
0.57 ± 0.01
0.53 ± 0.01
0.54 ± 0.02
0.50 ± 0.01
27.8 ± 0.4
28.5 ± 0.5
31.2 ± 0.3
30.6 ± 1.0
33.2 ± 0.5
Corn
Mieszko
10
12.5
15
17.5
20
0.48 ± 0.04
0.40 ± 0.03
0.36 ± 0.05
0.34 ± 0.03
0.30 ± 0.05
0.60 ± 0.01
0.52 ± 0.01
0.51 ± 0.02
0.50 ± 0.02
0.49 ± 0.03
26.7 ± 0.6
31.7 ± 0.5
32.0 ± 1.4
33.4 ± 0.8
33.6 ± 1.5
Oats
Borowiak
10
12.5
15
17.5
20
0.49 ± 0.03
0.44 ± 0.04
0.45 ± 0.03
0.40 ± 0.03
0.41 ± 0.06
0.68 ± 0.02
0.68 ± 0.02
0.65 ± 0.01
0.65 ± 0.02
0.61 ± 0.03
22.1 ± 1.1
22.4 ± 0.9
24.0 ± 0.5
23.9 ± 1.0
26.4 ± 1.7
Triticale
Fidelio
10
12.5
15
17.5
20
0.49 ± 0.03
0.51 ± 0.03
0.52 ± 0.04
0.39 ± 0.03
0.38 ± 0.06
0.66 ± 0.02
0.67 ± 0.02
0.63 ± 0.02
0.57 ± 0.02
0.58 ± 0.02
23.6 ± 0.7
23.0 ± 1.2
25.3 ± 1.1
28.8 ± 1.2
28.4 ± 1.2