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Table 16.10. Mean values (±St. Dev.) of the friction coefficient µ of barley grain variety Rudnik 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
(kPa)
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
Coefficient of wall friction µ
Stainless steel Galvanized steel Concrete B30
0.176 ± 0.006 0.217 ± 0.014 0.487 ± 0.013
0.163 ± 0.008 0.193 ± 0.009 0.468 ± 0.007
0.157 ± 0.002 0.173 ± 0.010 0.451 ± 0.012
0.160 ± 0.006 0.171 ± 0.003 0.444 ± 0.004
0.150 ± 0.005 0.171 ± 0.007 0.426 ± 0.004
0.152 ± 0.002 0.153 ± 0.005 0.478 ± 0.018
0.148 ± 0.001 0.145 ± 0.006 0.483 ± 0.011
0.149 ± 0.001 0.146 ± 0.001 0.483 ± 0.011
0.157 ± 0.004 0.139 ± 0.003 0.496 ± 0.004
0.163 ± 0.001 0.144 ± 0.001 0.480 ± 0.010
0.143 ± 0.005 0.166 ± 0.020 0.537 ± 0.022
0.139 ± 0.009 0.152 ± 0.009 0.547 ± 0.012
0.133 ± 0.003 0.160 ± 0.009 0.518 ± 0.011
0.131 ±0.003 0.147 ± 0.009 0.522 ± 0.002
0.131 ± 0.001 0.142 ± 0.003 0.490 ± 0.014
0.166 ± 0.015 0.169 ± 0.001 0.507 ± 0.021
0.141 ± 0.006 0.156 ± 0.004 0.540 ± 0.012
0.146 ± 0.016 0.144 ± 0.005 0.554 ± 0.012
0.145 ± 0.005 0.145 ± 0.005 0.520 ± 0.009
0.162 ± 0.006 0.155 ± 0.010 0.543 ± 0.007
0.245 ± 0.006 0.200 ± 0.014 0.549 ± 0.014
0.230 ± 0.017 0.185 ± 0.013 0.566 ± 0.012
0.220 ± 0.013 0.184 ± 0.009 0.594 ± 0.007
0.215 ± 0.008 0.176 ± 0.008 0.561 ± 0.014
0.225 ± 0.009 0.176 ± 0.012 0.582 ± 0.005