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Experiment
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2:
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February
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28, 2010
Setup
This experiment consisted of one 10' Manifold with 1 in. holes drilled every 5 cm on one side of the pipe. This resulted in an Am/Avc = 1.
Results & Discussion
Wiki Markup |
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2010 h2. Setup This experiment consisted of one 10' Manifold with 1 in. holes drilled every 5 cm on one side of the pipe. This resulted in an Am/Avc = 1. h2. Results & Discussion {float} !10'ManifoldResults.png|width=450px! h5. Figure 1: 10' Manifold Results compared with theoretical expectations {float} |
The
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results
...
of
...
our
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second
...
experiment
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seem
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to
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reaffirm
...
the
...
results
...
that
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we
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found
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in
...
the
...
first
...
experiment,
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despite
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the
...
problems
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with
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data
...
collection
...
that
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existed
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in
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the
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first
...
experiment.
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The
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flow
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starts
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low
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then
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peaks
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in
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the
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first
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quarter
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of
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our
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manifold
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and
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then
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gradually
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decreases
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after
...
that.
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And
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as
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showed
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in
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the
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graph,
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this
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is
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completely
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opposite
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what
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the
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theory
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of
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pressure
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recovery
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predicts.
...
The
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good
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news
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with
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these
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results
...
is
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that
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the
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flow
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from
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the
...
ports
...
might
...
be
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sufficiently
...
uniform
...
for
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it
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to
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work
...
in
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the
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AguaClara
...
plants.
...
The
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mean
...
velocity
...
is
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0.214
...
m/s
...
and
...
has
...
a
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standard
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deviation
...
of
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0.021
...
m/s,
...
which
...
might
...
be
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low
...
enough
...
variation
...
for
...
the
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AguaClara
...
plants.
...
The
...
mean
...
velocity
...
might
...
be
...
a
...
little
...
high
...
when
...
considering
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the
...
restriction
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of
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floc
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breakup
...
prevention
...
as
...
there
...
is
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an
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average
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energy
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dissipation
...
rate
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of
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19
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mW/kg
...
when
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the
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max
...
allowable
...
to
...
maintain
...
flocs
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is
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10
...
mW/kg.
...
This
...
was
...
determined
...
by
...
using
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the
...
equation
...
Latex |
---|
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$$
\varepsilon _{Max} = {1 \over {20D_{Port} }}\left( {{{V_{Port} } \over {K_{vc} }}} \right)^3 $$ |
...
We estimated the flow rate being provided by the pump to be 3.8 L/s. This value was calculated using the following equation:
Latex |
---|
$$
Q_{Manifold} = [\sum {(V_{Measured} \cdot A_{SedPort} } \cdot Pi_{vc} )] \cdot {{N_{portsTotal} } \over {N_{portsMeasured} }}
$$
|
This finds the average port flow of the measured ports and then multiplies it by the total number of ports. Given this flow rate, the velocity inside the manifold would be 0.21 m/s at the beginning of the manifold. This meets the specification of
Latex |
---|
$${V_{Scour}}$$ |
...
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0.15
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m/s
...
but
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the
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velocity
...
would
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decrease
...
throughout
...
the
...
manifold.
...
However,
...
after
...
considering
...
the
...
fact
...
that
...
the
...
manifold
...
is
...
oriented
...
with
...
the
...
ports
...
pointed
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downwards
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in
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the
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sedimentation
...
tank,
...
we
...
have
...
realized
...
that
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scour
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velocity
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is
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not
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as
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big
...
of
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an
...
issue
...
in
...
our
...
manifold
...
as
...
we
...
thought.
...
We
...
still
...
do
...
not
...
understand
...
the
...
fluid
...
mechanics
...
of
...
what
...
is
...
happening
...
in
...
the
...
manifold
...
and
...
need
...
to
...
investigate
...
that
...
further.
...
We
...
plan
...
on
...
doing
...
this
...
by
...
pushing
...
the
...
boundary
...
of
...
the
...
ratio
...
Am/Avc.
...
Theory
...
says
...
that
...
the
...
smaller
...
that
...
ratio
...
gets,
...
the
...
more
...
pressure
...
recovery
...
should
...
dominate
...
and
...
the
...
higher
...
velocity
...
should
...
be
...
at
...
the
...
end
...
of
...
the
...
manifold
...
compared
...
with
...
the
...
beginning
...
of
...
the
...
manifold
...
as
...
illustrated
...
in
...
...
...
on
...
the
...
main
...
page.
...
To
...
see
...
the
...
calculations
...
for
...
the
...
experiment,
...
use
...
the
...
...
...
and
...
the
...
...
...
.