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NRG Fluids Seminar

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by

Kamilah Carter

on 23 March 2014

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Transcript of NRG Fluids Seminar

PAMELA: Exposed
Why did our previous robot fail?
Known issues?
Potential problems?
Testing
Were the robot's pumps working?
Design an Experiment
Inlet Resevoir
Outlet Resevoir
Pump
Microchannel
1. Fill the inlet reservoir with octanol.
Octanol will be seen in the outlet resevoir if the pump is functional.
2. Add a dye to the inlet channel and determine how long it takes for the dye to reach the outlet reservoir under a variety of conditions.
Varying laser intensity (if possible with current laser)
Varying the distance between the laser and the pump
Varying the laser's angle-of-incidence onto the pump
Laser Conditions
A 660nm laser is used to irradiate the pumps, leading to thermal deformation, and pumping of the fluid.
Experimental Controls
measures expected fluid velocity without pumping
indicates any effects on the fluid purely due to the laser and not the pump.
can be compared to the time obtained when the laser is applied to the pump
What are we testing?
a novel microfluidic pump made of SU-8
control a MEMS device
create movement in 2D
We want to mount a pair of pumps to a device in order to...
Theory of Operation
Fire 660 nm laser at SU-8 membrane causing thermal deformation
Deformation closes inlet valves, and fluid in the chamber is jetted out the back
Ejected fluid generates thrust, and propels the device forward
Pulse laser at 50 Hz to achieve steady thrust
Implementing the System*
*Robot not to scale.
Laser
Wafer
Robot
Laser
2 pumps allow
for 2D movement
Actuate one pump at a time to turn left or right
Actuate both pumps to move straight forward
Control which pump(s) are being actuated by mounting focused laser emitter on high precision actuators
PAMELA
Why SU-8?
Choice based on a paper by Caglar on thermally attenuated SU-8 micro-calipers
When a laser is fired at the calipers, they expand and are able to grip objects
We're hoping to apply this theory to our pumps – thermally deform a thin membrane in order to create
a thruster for use in a
fluidic medium
What are we doing with
PAMELA?
Entering the ICRA Mobile Micro-robotics Competition 2012 in Minneapolis!
The Competition Involves...
Mobility challenges
Manipulation challenges
For example; the2011 competition featured a figure-8 racing circuit.
The Results
Lessons Learned
from initial experimentation
Nickel was originally used as a base for the pump
The metal was not able to absorb laser beams. It just reflected them.
further testing
Conclusion
The laser beams didn't cause the pumps to deform.
therefore
Alternate solution
research
SU-8 provided much better results, in terms of light absorption, thermal expansion, and pump deformation.
Our new model of robot has the pumps with SU-8 as the base.
The Result
therefore
So, who are we?
A student team / research group hybrid
A track record of success –- we claimed 1st place in the Microassembly Challenge at an IEEE Conference in May
A lot of undergrads –- 30 members strong, and looking to expand with grad students
A lot more than just a research team - we run several student and public outreach initiatives
Our Support
Corporate
On Campus
Dr. Yavuz
Dr. Cui
Dr. Mansour
Dr. Fidan
Salam Gabran
Feyruz Kitapli
WIN
MME
ECE
WEEF
Dean of
Engineering Office
Office of the Provost
Zaber Technologies
The Imaging Source
AMD
EngSoc
How can you get involved?
We're currently looking for graduate students to join as
UW_NRG Fellows
Fellows will be technical advisors to the group, and will provide invaluable experience in a laboratory setting
For more information, and to contact us, please visit
www.uwnrg.org
Full transcript