Nanofluidic Characterization System Review *numero dos David Sharp David West Justin Davis

Help 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 pipe Standard Temperature and Pressure Fully Developed Flow Steady Flow Incompressible Flow Losses calculated for plastic membrane holder dimensional changes.

Characterizing Flow

Flow rate Vs Pressure Drop

What does this graph tell us? Max pressure drop with flow at 10 ml/min= pa Min pressure drop with flow at.01ml/min= 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 flow

What does this graph tell us? Temperature hardly affects flow No need for expensive sensors ◦One thermocouple or RTD should be applicable ◦Max: Pa ◦Min: Pa

Pressure drop Vs temperature (varying flow)

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 (varying pipe diameters)

What does this graph tell us? The larger the pipe the lower the drop 1/8” 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)

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 resolution

What does this graph tell us? Shows pressure resolution when incrementing by.1 mL/min

Calculating Flow

Pressurizing the vessel

Using city water

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 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