Environmental Engineering Reference
In-Depth Information
Fig. 12
Picture of sand jets
emerging from a tilted bin
4.3 Experiments
In this work, the simultaneous effects of
D
,
w
,
ʸ
r
on the mass flow rate are
examined. As in our previous studies (Medina et al.
2013
,
2014
) here we employ
well characterized dry and non cohesive materials like sand beach (composed of
irregular grains of mean diameter
d
ʲ
and
cm
3
=
0
.
03 cm, bulk density
ˁ
=
1
.
5
±
0
.
01 gr
/
33
ⓦ
±
5
ⓦ
and angle of repose
ʸ
r
=
0
.
=
0
.
57
±
0
.
008 rad) and granulated sugar
01g/cm
3
and angle of
(mean diameter
d
=
0
.
073 cm, bulk density
ˁ
=
0
.
84
±
0
.
5
ⓦ
±
5
ⓦ
=
repose
ʸ
r
=
33
.
0
.
0
.
58
±
0
.
008 rad). These materials are made to emerge
from circular orifices of diameters
D
=
0
.
9
,
1 and 2 cm made on the side faces of
an acrylic-made box having walls with
w
3 and 0.9 cm. The experiments were
carried out in a temperature controlled laboratory (25
=
0
.
1
ⓦ
C and 45
±
±
10% R.H.).
10 cm
2
inner cross-
section and 50 cm height. Four different face-wall-thicknesses were used:
w
Experiments were performed using a transparent box, 10
×
=
0
.
3
,
0
.
4
,
0
.
6 and 0.9 cm. A schematic of the experimental setup is given in Fig.
13
where
Fig. 13
Scheme of the
experimental setup
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