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An experimental investigation on the speed of sand flow through a fixed porous bed
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Journal Article
An experimental investigation on the speed of sand flow through a fixed porous bed
2017
Overview
In this study, we document several experiments that investigate the speed of the flow of fine sand through a fixed porous bed of packed glass beads under various conditions, including the height of the sand column (
H
) and porous bed (
h
) and the diameter of the glass beads (
D
) and sand grains (
d
). The experiments are conducted with glass beads packed at a constant density and sand at a different dry bulk density. The results show that the height of the sand does not affect the speed of the sand flow. The speed of the sand flow (
v
) decreases with an increase in
h
until
h
approaches a certain value. An equation
v
=
a
g
D
l
n
(
D
kd
)
is proposed, where
a
and
k
are the experimentally determined coefficients. Moreover, the flow of sand through a fixed porous bed could be regarded as parallel flow through multiple pipes, and therefore, the relationship between
D
and the number and diameter of pipes,
N
and
D
p
, are discussed. Further investigations are needed for the result that the flow of sand through a porous bed or multiple parallel pipes cannot be simplified to flow through one orifice with a certain diameter.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
