C - Lublin
C - Lublin
C - Lublin
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compared to other materials indicates that the simplified procedure applied in this<br />
study may be not enough accurate for some materials. The angle of internal friction<br />
ϕ was smaller than the effective angle of friction δ of no more than 5 deg.<br />
The angle of natural repose θ of coarse food powders (groats, durum wheat<br />
flour, agglomerated milk and corn meal) was found to be close to the effective<br />
angle of internal friction δ while for fine powders θ was larger than the angle δ.<br />
Only in the case of NaCl salt the angle of natural repose θ was significantly smaller<br />
than the effective angle of friction δ. This confirms the opinion that the angle of<br />
repose does not coincide with the angle of internal friction.<br />
Within the range of consolidation stress applied in this study the food powders<br />
tested were determined to have the flow index which would classify them as free<br />
(i