| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 101 === Nowadays a lot of scholars devoted considerable effort to mixed convection phenomenon and the results of research have also been widely used in engineering. For example, oil-drilling system, biotechnology, filtration system, high efficiency heat exchanger, chemical filling bed, food drying, solar collectors, nuclear energy systems, heat pipe, electronic cooling, thermal transport of electronic package. The advantage of natural convection for equipment is that it is not only easy to use but also maintenance free. Its construction is quite simple and is free of power supply.
This research aims at discussing the natural convection in a confined square enclosure due to the variation of heat source length, Rayleigh number, fluid composition, and its concentration. This research use Gambit to set up numerical model. By using the Fluent packaged software to proceed the simulation. The parameters selected are Ra=103~ 106, concentration 1%~5% and heat source length of hx=0.25m，hy=0.75m、hx=0.5m，hy=0.5m、hx=0.75m，hy=0.25m. The results of flow fields and hear transfer rate have been also compared in between for different values of Rayleigh number, heat source length, and nanoparticle concentration.
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