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
  • 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.
design constraints
Design Constraints
  • Limited Space
  • Must survive high acceleration events
  • Easily manufactured
  • Low cost performance ratio
possible solutions
Possible Solutions
  • Axial Flow fan
  • Radial flow fan
  • Gear Pumps
  • Piston Pumps
  • Diaphragm Pumps
  • Corona Discharge
design selection
Design Selection
  • 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
  • Eliminate wear parts
  • Use solid state solutions wherever possible
  • Durable structure and packaging!
designing for manufacturability
Designing for Manufacturability
  • 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
  • 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
  • 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
  • Simple
  • Cheap
  • Reliable

Courtesy of CUI Inc. 2007

www.cui.com

valves
Valves
  • 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!
valve assembly
Valve Assembly
  • A diaphragm pump needs two valves to operate, a suction and discharge.
  • Therefore the valve arrangement requires two inline diffusers

Valve Assembly

results
Results

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

Pump On

Pump On

Pump Off

Pump Off

particle image velocimetry piv
Particle Image Velocimetry (PIV)
  • 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
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