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.


Background1

Background


Design requirements

Design Requirements


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!


Diffuser concept

Diffuser Concept


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


Putting it all together exploded view

Putting It All TogetherExploded View


Putting it all together pump cross section

Putting It All TogetherPump Cross Section


Prototype parts

Prototype Parts


Assembled product

Assembled Product


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


Piv setup

PIV Setup


Physical setup

Physical Setup


Flow visualization particle trace image

Flow VisualizationParticle Trace Image


More flow visualization

More Flow Visualization


More flow visualization1

More Flow Visualization


Visualized operation

Visualized Operation


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