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

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Page 1: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Constant Head Flow Control

Dirty Baker:Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Page 2: 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

Page 3: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Modeling Scheme

f

flitersandpipe

hHQ

ddg

LQ

LD

f

gA

223/2

22

1

128

2

1

Page 4: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

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?

Page 5: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

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

Page 6: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Our Solution

A “pulley controlled” flow

Uses a pulley Controls flow Really ties the room

together

Page 7: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Tube connector

Flexible tubing

Thin wood boards

Wood dowel

Rope

Float

Water level

Water drop

Animation of the Prototype

Page 8: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

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

Page 9: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

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

Page 10: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Advantages Disadvantages

Page 11: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

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

Page 12: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Future Research

Alternate MaterialsAdjustment of FlowInitial CalibrationImplement with a SSFOther Applications

Page 13: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Chemical Metering

Page 14: Constant Head Flow Control Dirty Baker: Andrea Baker, Chris Baker, ‘Lex Baker, Michael Baker

Extreme Close-Up