Environmental Engineering Reference
In-Depth Information
Fig. 7
Plot of the mass flow
rate of beach sand emerging
from the lower standpipe
versus the theoretical
corr
e
lati
o
n
ˁ
1
2
D
2
.Thisflow
comes from the upper
standpipe and crosses the
elbow zone
g
(ʱ
−
ʸ
r
)
b
diameter and
w
=
1
.
2 cm. In this case the L-valve angle was
ʱ
=
1
.
01 rad and the
term
(ʱ
−
ʸ
r
)
=
0
.
44. In another case the L-valve had has
D
=
1
.
34 mA,
w
=
1
.
2cm.
Therefore
ʱ
=
0
.
85 rad and thus
(ʱ
−
ʸ
r
)
=
0
.
28. The linear fit in such a plot shows
that Eq. (
1
) is correct. In this case
a
0283.
In conclusion an L-Valve without aeration can be useful to reduce drastically the
mass flow rate, moreover, it maintains the mass flow rate constant as is deduced from
Figs.
4
and
7
.
=
0
.
4 Conclusions
In this work we did experiments to estimate the granular mass flow rate from
L-valves. We found that the flow rate from an L-valve obeys Eq. (
1
) very well.
To our knowledge this type of studies are the first in the specialized literature for this
specific regime.
Acknowledgments
This work was made under the partial support of Project SIP20141404.
References
Chan ChW, Seville J, Fan X, Baeyens J (2009) Particle motion in L-valve as observed by positron
emission particle tracking. Powder Technol 193:137-149
Chovichien N, Pipatmanomai S, Chungpaibulpatana S (2013) Estimate of solids circulation rate
through an L-valve in a CFB operating at elevated temperature. Powder Technol 235:886-900
Kesava RK, Nott PR (2008) An introduction to granular flow. Cambridge University Press,
New York
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