Environmental Engineering Reference
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Fig. 15
Plots of the experimental mass flow rates:
a
for sand beach and
b
for granulated sugar
Fig. 16
Plot of Eq. (
2
) by using data from our experiments
5 Pressures in a Silo
As it was mentioned before, pressures in quiescent liquids (White
1994
) and in non-
cohesive granular materials at rest (Janssen
1895
) are quite different among them.
Consider a vertical cylindrical container filled with a granular material. The vertical
pressure on a horizontal plane at a certain depth below the surface of the material
does not increase linearly with depth, as it would be for a normal liquid. Instead, the
Janssen's model predicts that this pressure tends to a constant value independently
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