碩士 / 國立成功大學 / 系統及船舶機電工程學系碩博士班 / 100 / This thesis used finite volume method (FVM) to analyze steady-state flow and heat transfer in three-dimensional natural convection with heat fins. Using finite volume method discretes the Navier-Stokes equations and Energy Equation and then constructs a system of algebraic equations. It can be solved by semi-implicit method for pressure-linked equation (SIMPLE), and the solution must be iterated to convergence within each step to obtain the velocity field, pressure field, and temperature field.
First, this thesis discussed flow and heat transfer phenomenon simply for the basic heat fin(F1), as the Rayleigh number are set four numbers, and the Prandtl number keep a constant value as 0.71, and then for added the dimples on heat fin surfaces. On one hand this thesis considered the upwind degrees of dimples as 30°, 25°, and 15°, and on the other hand also considered the distribution of dimples and different density of heat fins. This thesis discussed the influence of above-mentioned factors on local Nusselt number, average Nusselt number, velocity field, temperature field, and the heat transfer enhancement of heat fins. The results show that different density of heat fins is an important factor. The upwind degree of dimples is 15° that has better heat dissipation ability for a higher density of heat fin. However, the upwind degrees of dimples are 30° and 25° that have better heat dissipation ability for a lower density of heat fin.
| Identifer | oai:union.ndltd.org:TW/100NCKU5345041 |
| Date | January 2012 |
| Creators | Da-YuGuo, 郭達譽 |
| Contributors | Horng-Wen Wu, 吳鴻文 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 127 |
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