constant head flow control dirty baker: andrea baker, chris baker, ‘lex baker, michael baker
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Constant Head Flow Control
Dirty Baker:Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker
Flow Rate Through a SSF
0
5
10
15
20
25
30
0 0.5 1 1.5 2Time, hours
Flo
w, c
m3 /s
Clean Slow Sand Filter (Hagen Poiseuille)
Post-Filter Tube
Multiple Orifices Pre-Filter
Post-Filter Needle Valve
Post-Filter Orifice in Vertical Tube
Constant Head
Modeling Scheme
f
flitersandpipe
hHQ
ddg
LQ
LD
f
gA
223/2
22
1
128
2
1
Model Description
Head loss devices:
“Slow the flow, how low can it go?”Post-filter tube, oh no!Multiple pre-filter orifice showPost-filter needle valve we forgoPost-filter orifice in vertical tube, Ross Perot?
Coupled Model Results
0
0.5
1
1.5
2
2.5
3
3.5
4
0 2 4 6 8 10 12 14Time, hours
Flo
w, c
m3 /s
Clean Slow Sand Filter (Hagen Poiseuille)
Post-Filter Tube
Multiple Orifices Pre-Filter
Post-Filter Needle Valve
Post-Filter Orifice in Vertical Tube
Constant Head
Our Solution
A “pulley controlled” flow
Uses a pulley Controls flow Really ties the room
together
Tube connector
Flexible tubing
Thin wood boards
Wood dowel
Rope
Float
Water level
Water drop
Animation of the Prototype
Average Flow Rates
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
0 2 4 6 8 10 12 14
Time, hours
Vo
lum
e in
res
erv
oir
, mL Vol = 2550 time - 397
Vol = 772 time + 141
•Green: 61.2 L/day, 0.050 m/hr •Blue: 18.5 L/day, 0.015 m/hr
Shallow Slope
y = 7.04x + 7860
9300
9350
9400
9450
9500
9550
9600
9650
9700
225 227 229 231 233 235 237
Time, min
Vo
lum
e in
res
erv
oir
, mL
Advantages Disadvantages
Advantages Disadvantages
Simple to Construct Easy to Understand No Clogging Inexpensive Materials Available Easy to Calibrate Delivers Constant
Flow
Size Constraints Sensitive to h Batch process
Future Research
Alternate MaterialsAdjustment of FlowInitial CalibrationImplement with a SSFOther Applications
Chemical Metering
Extreme Close-Up
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