Investigation of air mover for small volume spot cooling applications
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Investigation of Air Mover for Small Volume Spot Cooling Applications. Design Group Members: Thomas Staley Andrey Tsinovkin Tuan Le Dan Somlea Faculty Advisor: James E. Morris Industry Advisor: Christopher Coleman. Background.

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Investigation of air mover for small volume spot cooling applications

Investigation of Air Mover for Small Volume Spot Cooling Applications

Design Group Members:

Thomas Staley

Andrey Tsinovkin

Tuan Le

Dan Somlea

Faculty Advisor:

James E. Morris

Industry Advisor:

Christopher Coleman


Background
Background Applications

  • A chip on the Differential Probes produced by Tektronix overheats and is damaged in the process.

  • Investigate and develop a practical component and a realizable method to move air in a small volume for the purposes of spot cooling.


Background1
Background Applications


Design requirements
Design Requirements Applications


Design constraints
Design Constraints Applications

  • Limited Space

  • Must survive high acceleration events

  • Easily manufactured

  • Low cost performance ratio


Possible solutions
Possible Solutions Applications

  • Axial Flow fan

  • Radial flow fan

  • Gear Pumps

  • Piston Pumps

  • Diaphragm Pumps

  • Corona Discharge


Design selection
Design Selection Applications

  • Rotating equipment is undesirable

    • The target application may experience acceleration loads in excess of 20g difficult to stabilize rotating equipment under these conditions

    • 10,000 hour lifetime creates incentive to eliminate wear parts.

    • Rotating equipment is difficult to scale down to the desired level.


Designing for reliability
Designing for Reliability Applications

  • Eliminate wear parts

  • Use solid state solutions wherever possible

  • Durable structure and packaging!


Designing for manufacturability
Designing for Manufacturability Applications

  • Engineering materials based on manufacturing processes rather than design requirements when possible.

  • Eliminate 3D part features by means of a 2D layering strategy.

    • Think of a soccer ball, it is a three dimensional structure, but it is manufactured as a composition of 2D pieces.


Final selection
Final Selection Applications

  • A diaphragm pump concept was chosen

    • A piezoelectric bending element was used as the diaphragm

    • Solid state diffusers used as intake and discharge valves

    • Manufactured from stainless steel in three steps, assembled with silicone RVT


Piezoelectric bender
Piezoelectric Bender Applications

  • Actuated electrically

  • Behaves like a diaphragm

  • Commonly used as speakers in portable devices such as cellular phones, laptops, etc.

Piezoelectric Bender Modes of Vibration


Piezoelectric advantages
Piezoelectric Advantages Applications

  • Simple

  • Cheap

  • Reliable

Courtesy of CUI Inc. 2007

www.cui.com


Valves
Valves Applications

  • The valves were constructed using inline diffusers

  • Diffusers in this application operate based on the principle of vena contracta

  • The geometric arrangement acts as a high loss valve with no moving parts!


Diffuser concept
Diffuser Concept Applications


Valve assembly
Valve Assembly Applications

  • A diaphragm pump needs two valves to operate, a suction and discharge.

  • Therefore the valve arrangement requires two inline diffusers

Valve Assembly


Putting it all together exploded view
Putting It All Together ApplicationsExploded View


Putting it all together pump cross section
Putting It All Together ApplicationsPump Cross Section


Prototype parts
Prototype Parts Applications


Assembled product
Assembled Product Applications


Results
Results Applications

Hot Film Anemometer

  • JLC Industries EE57-1 Miniature Air Velocity

    Transmitter

  • Peak velocity occurs at:

    First Prototype - 500-600 Hz

    Second Prototype – 5,000 – 6,000 Hz

  • Peak velocity

    First Prototype - 120 lfm

    Second Prototype -600 lfm at 5V @ 20mA

    Heat Transfer Analysis

    - First Prototype

    • 8.6% Difference in heat transfer coefficient

      - Second Prototype

    • 42.8% Difference in heat transfer coefficient

  • Resistor – 0.25 watt Carbon Film Resistor

    • 30% Reduction in thermal resistance


Results1
Results Applications

Pump On

Pump On

Pump Off

Pump Off


Particle image velocimetry piv
Particle Image Velocimetry (PIV) Applications

  • Utilizes a sheet of light in a dark room to visualize particles moving in one plane

  • The concept relies on CCD cameras to track the particles as a function of distance traveled over time

  • Results provide speed and direction of the flow field


Piv setup
PIV Setup Applications


Physical setup
Physical Setup Applications


Flow visualization particle trace image
Flow Visualization ApplicationsParticle Trace Image




Visualized operation
Visualized Operation Applications