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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
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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
...
results
...
of
...
our
...
second
...
experiment
...
seem
...
to
...
reaffirm
...
the
...
results
...
that
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we
...
found
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in
...
the
...
first
...
experiment,
...
despite
...
the
...
problems
...
with
...
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
...
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
...
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
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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
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might
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be
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sufficiently
...
uniform
...
for
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it
...
to
...
work
...
in
...
the
...
AguaClara
...
plants.
...
The
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mean
...
velocity
...
is
...
0.214
...
m/s
...
and
...
has
...
a
...
standard
...
deviation
...
of
...
0.021
...
m/s,
...
which
...
might
...
be
...
low
...
enough
...
variation
...
for
...
the
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AguaClara
...
plants.
...
The
...
mean
...
velocity
...
might
...
be
...
a
...
little
...
high
...
when
...
considering
...
the
...
restriction
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of
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floc
...
breakup
...
prevention
...
as
...
there
...
is
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an
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average
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energy
...
dissipation
...
rate
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of
...
19
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mW/kg
...
when
...
the
...
max
...
allowable
...
to
...
maintain
...
flocs
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is
...
10
...
mW/kg.
...
This
...
was
...
determined
...
by
...
using
...
the
...
equation
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{latex} $$
\varepsilon _{Max} = {1 \over {20D_{Port} }}\left( {{{V_{Port} } \over {K_{vc} }}} \right)^3 $$ {latex} |
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We
...
estimated
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the
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flow
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rate
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being
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provided
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by
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the
...
pump
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to
...
be
...
3.8
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L/s.
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This
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value
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was
...
calculated
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using
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the
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following
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equation:
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{latex} $$ Q_{Manifold} = [\sum {(V_{Measured} \cdot A_{SedPort} } \cdot Pi_{vc} )] \cdot {{N_{portsTotal} } \over {N_{portsMeasured} }} $$ {latex} |
This
...
finds
...
the
...
average
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port
...
flow
...
of
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the
...
measured
...
ports
...
and
...
then
...
multiplies
...
it
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by
...
the
...
total
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number
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of
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ports.
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Given
...
this
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flow
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rate,
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the
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velocity
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inside
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the
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manifold
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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
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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
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{latex} $${V_{Scour}}$$ {latex} |
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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
...
throughout
...
the
...
manifold.
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However,
...
after
...
considering
...
the
...
fact
...
that
...
the
...
manifold
...
is
...
oriented
...
with
...
the
...
ports
...
pointed
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downwards
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in
...
the
...
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
...
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,
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the
...
more
...
pressure
...
recovery
...
should
...
dominate
...
and
...
the
...
higher
...
velocity
...
should
...
be
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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
...
...
...
.