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16.3. Coefficient of friction
Table 16.8. Mean values (±St. Dev.) of the friction coefficient µ of wheat grain variety Begra at the
moisture content of 10-20% against stainless steel, galvanized steel and concrete B30 determined at the
normal pressure of 20-60 kPa
Moisture
content (%)
10
12.5
15
17.5
20
Normal
stress
Coefficient of wall friction µ
(kPa) Stainless steel Galvanized steel Concrete B30
20
30
40
50
60
20
30
40
50
60
20
30
40
50
60
20
30
40
50
60
20
30
40
50
60
0.189 ± 0.003
0.160 ± 0.002
0.152 ± 0.004
0.159 ± 0.006
0.160 ± 0.004
0.186 ± 0.001
0.163 ± 0.006
0.156 ± 0.004
0.170 ± 0.005
0.163 ± 0.002
0.191 ± 0.007
0.189 ± 0.008
0.174 ± 0.012
0.212 ± 0.002
0.182 ± 0.003
0.249 ± 0.011
0.217 ± 0.004
0.220 ± 0.009
0.252 ± 0.009
0.287 ± 0.020
0.340 ± 0.028
0.321 ± 0.023
0.277 ± 0.022
0.277 ± 0.012
0.279 ± 0.016
0.174 ± 0.010
0.183 ± 0.004
0.170 ± 0.003
0.169 ± 0.002
0.165 ± 0.003
0.178 ± 0.004
0.186 ± 0.003
0.173 ± 0.003
0.173 ± 0.005
0.171 ± 0.001
0.209 ± 0.001
0.201 ± 0.001
0.184 ± 0.002
0.139 ± 0.001
0.165 ± 0.004
0.204 ± 0.005
0.180 ± 0.001
0.169 ± 0.003
0.161 ± 0.002
0.143 ± 0.004
0.245 ± 0.014
0.274 ± 0.028
0.224 ± 0.020
0.201 ± 0.018
0.191 ± 0.008
0.541 ± 0.014
0.497 ± 0.020
0.496 ± 0.007
0.476 ± 0.010
0.468 ± 0.005
0.502 ± 0.009
0.524 ± 0.007
0.510 ± 0.018
0.480 ± 0.009
0.489 ± 0.006
0.540 ± 0.030
0.605 ± 0.018
0.546 ± 0.023
0.529 ±0.009
0.519 ± 0.007
0.571 ± 0.035
0.574 ± 0.014
0.593 ± 0.003
0.605 ± 0.008
0.602 ± 0.004
0.562 ± 0.009
0.587 ± 0.021
0.598 ± 0.009
0.580 ± 0.006
0.595 ± 0.010