| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 95 === Natural convection of micropolar fluids in a square enclosure filled with fluid-saturated porous medium is numerically investigated in this study. The model is a two-dimensional enclosure filled with porous media. Both the top and the bottom walls are adiabatic. The left wall is also adiabatic except a heat source with finite length w is installed on the lower part. The wall on the right side is kept at a lower temperature Ti and Th>Tl.
The governing equations for micropolar fluid were first presented by A.C.Eringen, wherein we furthermore expand the applications to non-Newtonian fluids. The numerical computations were obtained using the cubic spline collocation method in a personal computer. The governing equations, including stream function, vorticity, microrotation, and energy, were first put in dimensionless form. The governing parameters appearing in present study are Pr, Gr, Da, and several characteristic parametersof the micropolar fluids. The numerical results of the flow fields are discussed with plots of isotherms, streamlines, and velocity vectors. Computational results show that the Newtonian fluid has more significant convection heat transfer effect than that of micropolar fluid and the porous medium can effectively enhance the heat transfer rate.
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