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www.glacialtech.com

www.glacialtech.com. Geometry Parameters Analysis of CPU Heat Sinks. GlacialTech, INC. 27th September 2002. www.glacialtech.com. Introduction.

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www.glacialtech.com

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  1. www.glacialtech.com Geometry Parameters Analysis of CPU Heat Sinks GlacialTech, INC. 27th September 2002

  2. www.glacialtech.com Introduction To understand the effects of the geometry parameters for aluminum extrusion fins, we employed PHOENICS and experimentation to prove the results each other. The parameters are: the ratio of thickness and pitch between fins fin number length for heat sink height of fins

  3. Decide the geometry parameter of heat sinks Phoenics simulation Manufacturing extrusion fins VR-EDITOR 1. Build physics module 2. B.C. setting 3. Phoenics setting Experimentation Check thermocouple EARTH （Iteration） Keep environment temp. is 35℃ No Convergence 1.Calculate thermal resistance 2.Discussion of results No Yes Steady VR-VIEWER Generate temperature、velocity and pressure field Yes Measure CPU temp. Flowchart for the research

  4. www.glacialtech.com Physics model • environment temp. is 35 ℃ • heat flux is 45 W • Flow rate is 17 CFM

  5. www.glacialtech.com PHOENICS Setting • steady state • elliptic – staggered formulation • cartesian coordinate system • the fluid is incompressible • k-ε turbulence model • convergence criterion is 0.1 ﹪ • no heat flux in heat sink

  6. www.glacialtech.com Experimentation

  7. www.glacialtech.com The ratio of thickness and pitch between fins Fin number DiscussionⅠ: blue line: green line: We have better performance in more fins in the same ratio of p/t. p: pitch of fins t: thickness of fins

  8. www.glacialtech.com Discussion Ⅱ:Length for heat sink The effect of increasing length of heat sinks is not apparent for decreasing thermal resistance. The good value of length of heat sink is about 75 mm.

  9. www.glacialtech.com Discussion Ⅲ :Height of fins When the height of fins is less than 20 mm, thermal resistance has large drop.

  10. www.glacialtech.com Conclusion and Development 1. Thermal resistance will decrease when thickness were increased, but increasing fin number has bigger effect than increasing thickness of fins. 2. Increasing height of fins will provide good solution but increasing length of heat sinks is not apparent for decreasing thermal resistance. 3. We will build a system which will help us to design extrusion fins quickly in the future. 4. General extrusion ratio is 20 now, but the ratio in GlacialTech is 28, so to promote extrusion ratio is our purpose in the future.

  11. www.glacialtech.com Application • Power dissipation=70W • Flow rate = 13.3CFM • Environment Temp. = 35℃ • Thermal Resistance=0.357 ℃/W • Noise=25 dB

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