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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 |
|---|
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
...
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,
...
despite
...
the
...
problems
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with
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data
...
collection
...
that
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existed
...
in
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the
...
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
...
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
...
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
...
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
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ports
...
might
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be
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sufficiently
...
uniform
...
for
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it
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to
...
work
...
in
...
the
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AguaClara
...
plants.
...
The
...
mean
...
velocity
...
is
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0.214
...
m/s
...
and
...
has
...
a
...
standard
...
deviation
...
of
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0.021
...
m/s,
...
which
...
might
...
be
...
low
...
enough
...
variation
...
for
...
the
...
AguaClara
...
plants.
...
The
...
mean
...
velocity
...
might
...
be
...
a
...
little
...
high
...
when
...
considering
...
the
...
restriction
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of
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floc
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breakup
...
prevention
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as
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there
...
is
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an
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average
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energy
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dissipation
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rate
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of
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19
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mW/kg
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when
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the
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max
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allowable
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to
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maintain
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flocs
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is
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10
...
mW/kg.
...
This
...
was
...
determined
...
by
...
using
...
the
...
equation
...
| Latex |
|---|
...
$$
\varepsilon _{Max} = {1 \over {20D_{Port} }}\left( {{{V_{Port} } \over {K_{vc} }}} \right)^3 $$ |
...
We estimated the flow rate being provided by the pump to be 3.8 L/s.
...
This
...
value
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was
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calculated
...
using
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the
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following
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equation:
| Latex |
|---|
} $$ Q_{Manifold} = [\sum {(V_{Measured} \cdot A_{SedPort} } \cdot Pi_{vc} )] \cdot {{N_{portsTotal} } \over {N_{portsMeasured} }} $$ {latex} |
This
...
finds
...
the
...
average
...
port
...
flow
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of
...
the
...
measured
...
ports
...
and
...
then
...
multiplies
...
it
...
by
...
the
...
total
...
number
...
of
...
ports.
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Given
...
this
...
flow
...
rate,
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the
...
velocity
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inside
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the
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manifold
...
would
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be
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0.21
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m/s
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at
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the
...
beginning
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of
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the
...
manifold.
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This
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meets
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the
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specification
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of
...
| Latex |
|---|
...
$${V_{Scour}}$$ |
...
...
0.15
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m/s
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but
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the
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velocity
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would
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decrease
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throughout
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the
...
manifold.
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However,
...
after
...
considering
...
the
...
fact
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that
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the
...
manifold
...
is
...
oriented
...
with
...
the
...
ports
...
pointed
...
downwards
...
in
...
the
...
sedimentation
...
tank,
...
we
...
have
...
realized
...
that
...
scour
...
velocity
...
is
...
not
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as
...
big
...
of
...
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
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that
...
the
...
smaller
...
that
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ratio
...
gets,
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the
...
more
...
pressure
...
recovery
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should
...
dominate
...
and
...
the
...
higher
...
velocity
...
should
...
be
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at
...
the
...
end
...
of
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the
...
manifold
...
compared
...
with
...
the
...
beginning
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of
...
the
...
manifold
...
as
...
illustrated
...
in
...
...
...
on
...
the
...
main
...
page.
...
To
...
see
...
the
...
calculations
...
for
...
the
...
experiment,
...
use
...
the
...
...
...
and
...
the
...
...
...
.