| Summary: | 碩士 === 淡江大學 === 機械工程學系 === 88 === The research presents a novel type of heat-sinks using the fractal geometry of Hilbert curve for heat dissipation of CPU modules. A simulation software package, Phoenics is used to proceed numerical simulation, and the results of numerical simulation are compared with experimental data. Numerical simulation results have shown that the variation of error region for CPU average temperature between the simulated data and experimental measurement with k-εturbulent model is between 2.45~7.25%. Moreover, the thermal resistance of heat-sinks are maintained constant when power dissipation is between 15~35 watts. Thus the method of simulation and experimental operation both are verified and can be used to test the change of design parameters of heatsink module.
The performance of fractal-fin dissipation is increased when the height of fins and thickness of base-plate increase, the area of base-plate adjust and some grooves are cut. With the parameters above to design new heat-sinks, average temperature of CPU in 3 order fractal-fins are 4~5 degree ℃ lower than that of experimented data have shown grooved-fins heatsink by numerical simulation. The average temperature of CPU in 3 order fractal-fins are 9~10 degree ℃, which is lower than that of grooved-fins. Therefore the fractal geometry of Hilbert curve can be used in thermal design of CPU heat-sinks, and fractal-fins have better performance when the dimensions of fractal-fins are larger than or the same dimensions as grooved-fins.
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