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

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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

  • 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.


Background


Design Requirements


Design Constraints

  • Limited Space

  • Must survive high acceleration events

  • Easily manufactured

  • Low cost performance ratio


Possible Solutions

  • Axial Flow fan

  • Radial flow fan

  • Gear Pumps

  • Piston Pumps

  • Diaphragm Pumps

  • Corona Discharge


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

  • Eliminate wear parts

  • Use solid state solutions wherever possible

  • Durable structure and packaging!


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

  • 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

  • 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

  • Simple

  • Cheap

  • Reliable

Courtesy of CUI Inc. 2007

www.cui.com


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


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 TogetherExploded View


Putting It All TogetherPump Cross Section


Prototype Parts


Assembled Product


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


Results

Pump On

Pump On

Pump Off

Pump Off


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


Physical Setup


Flow VisualizationParticle Trace Image


More Flow Visualization


More Flow Visualization


Visualized Operation


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