| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 92 === Numerical analysis of cooling of electronic components is a hot research topic in the field of computational fluid dynamics due to its importance in the development of miniature size computers as well as in achieving high speed computation on desk top computers. The heat generated by the various electronic components has to be continuously removed for the efficient and continuous operation of the equipment. The advancement in high speed computing as well as the development of flow algorithms has enabled the researchers to compute the flow and heat transfer parameters for the design of cooling systems for computers. Numerical analysis of electronic cooling can be modeled by analyzing a channel with a number of solid blocks in the channel. The system is represented by the two-dimensional Navier-Stokes equations and the energy equation. In the present work an attempt is made to model the cooling of printed circuit board (PCB) and heat sinks by simulating channel flows in the presence of single, three, four, six and ten solid blocks. Two dimensional Navier-Stokes equations in primitive variable form have been solved using the finite element method.
Simulation results for different channel flow cases with the solid blocks indicate the formation of eddy zones at the downstream region of the solid blocks. The development of thin thermal boundary layers at the leading edge of the solid blocks is correctly predicted in the present work. The effect of the presence of number of solid blocks on the flow field as well as on the temperature fields are plotted in the form of streamline patterns, velocity vector distributions and temperature contours in the channel. The eddy zones formed at the downstream sides of the solid blocks reduce the convective heat transfer due to the discontinuity in the temperature profiles. The present numerical model could predict the effect of number of solids in the channel on the length taken by the fluid to become uniform at the downstream side of the channel.
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