Nanofluidic Nanofluidic Characterization System Characterization System

Review *numero dosReview *numero dosDavid SharpDavid WestJustin Davis

Help we needHelp we need

Better understanding of this low flow

Understanding what we’ve calculated◦Is this data on par with what we should be seeing for results?

Calculation Assumptions

Laminar Flow through the pipeStandard Temperature and PressureFully Developed FlowSteady FlowIncompressible FlowLosses calculated for plastic membrane

holder dimensional changes.

Characterizing Flow

Flow rate Vs Pressure DropFlow rate Vs Pressure Drop

0 1 2 3 4 5 6 7 8 9 100

1

2

3

4

5

6

7

8Pressure Drop vs Flow Rate (Constant Temperature 20°C)

Flow Rate (mL/min)

Pre

ssur

e D

rop

(Pa)

What does this graph tell us?What does this graph tell us?

Max pressure drop with flow at 10 ml/min=7.37632 pa

Min pressure drop with flow at .01ml/min=.00737632 Pa

Pressure drop is very small within this flow range◦Pressure gauges not available to a resolution

down to .01 Pa.

Pressure drop Vs Temp Constant Pressure drop Vs Temp Constant flowflow

20 20.5 21 21.5 22 22.5 233.6696

3.6698

3.67

3.6702

3.6704

3.6706

3.6708Pressure Drop vs Temperature (Constant Flow Rate 5mL/min)

Temperature °C

Pre

ssur

e D

rop

(Pa)

What does this graph tell us?What does this graph tell us?

Temperature hardly affects flowNo need for expensive sensors

◦One thermocouple or RTD should be applicable

◦Max: 3.67077 Pa◦Min: 3.66971 Pa

Pressure drop Vs temperature Pressure drop Vs temperature (varying flow)(varying flow)

20 20.5 21 21.5 22 22.5 232.9355

2.936

2.9365

2.937

2.9375

2.938

2.9385

2.939Pressure Drop vs Temperature with Lines of Constant Flow

Temperature °C

Pre

ssur

e D

rop

(Pa)

4.000 mL/min

4.001 mL/min4.002 mL/min

4.003 mL/min

What does this graph tell us?What does this graph tell us?

Clearer depiction of flow change and pressure drop

Appears that resolution should be down to .001 Pa

This resolution cannot be measured with a sensor◦Possible error in calculation?

Flow rate vs Pressure Drop Flow rate vs Pressure Drop (varying pipe diameters)(varying pipe diameters)

0 1 2 3 4 5 6 7 8 9 100

1

2

3

4

5

6

7

8Pressure Drop vs Flow Rate (Constant Lines of Inlet/Outlet Pipe Diameter)

Flow Rate (mL/min)

Pre

ssur

e D

rop

(Pa)

1/8 in3/16 in

1/4 in

3/8 in

1/2 in3/4 in

What does this graph tell us?What does this graph tell us?

The larger the pipe the lower the drop1/8” has highest pressure change

◦If gauge readable pressure drop wanted this may be the best size pipe to use

Pressure drop vs D (varying flows)Pressure drop vs D (varying flows)

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.80

1

2

3

4

5

6

7

8Pressure Drop vs Inlet/Outlet Diameter (Constant Lines of Flow Rate)

Inlet/Outlet Diameter (in)

Pre

ssur

e D

rop

(Pa)

1 mL/min2 mL/min

3 mL/min

4 mL/min

5 mL/min6 mL/min

7 mL/min

8 mL/min

9 mL/min10 mL/min

What does this graph tell us?What does this graph tell us?

With flow rate down to 1 mL/min pressure change extremely hard to visualize

The higher the flow the greater the drop in pressure

Pressure resolutionPressure resolution

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

1

2

3

4

5

6

7

8x 10

-3 Pressure Resolution vs Smallest Flow Rate Increment

Flow Rate (mL/min)

Pre

ssur

e D

rop

(Pa)

Assumes 1% of P Drop from Q Step Possibilities as Reasonable Resolutions

What does this graph tell us?What does this graph tell us?

Shows pressure resolution when incrementing by .1 mL/min

Calculating FlowCalculating Flow

Pressurizing the vessel Pressurizing the vessel

Using city waterUsing city water

Using City water feasable?Using City water feasable?

Could be a valid solution

Pipe diameter would have to be extremely small

Computer Interface

LabView’s visual interface makes it ideal for observing data during experimentation

Ease to control sensors and other instruments

Data can then be either exported from LabView for further analysis

Although MatLab is a powerful program, LabView’s user friendly interface makes it the better choice

Final ConsiderationsFinal Considerations

Key Considerations Moving forward◦Keeping under budget◦Keeping within specifications◦Accuracy

What Lies Next◦Exact calculations for chosen flow system◦Computerized detailed schematics of system