| Summary: | 碩士 === 逢甲大學 === 機械與電腦輔助工程學系 === 103 === This study numerically investigates the influence of Soret and Dufour effects on natural convection in 2-D rectangular confined space. The CFD software FLUENT is utilized for numerical simulation. A number of factors are studied regarding their effects on the flow field and heat/mass transfer of natural convection within the 2-D rectangular space, including Soret number (Sr), Dufour number (Df), Prandtl number (Pr), Buoyancy ratio (N), Lewis number(Le), Rayleigh number (Ra) and positions of heat source and pollutant.
Results are listed below. When Dufour effect (Df) increases, the average Nusselt number (Nu) decreases; when Soret effect (Sr) increases, the average Sherwood number (Sh) decreases. Increase in both Prandtl number (Pr) and Rayleigh number (Ra) will strengthen heat transfer and mass transfer. The average Nusselt number (Nu) and Sherwood number (Sh) respectively reach the minima at N=2 and N=-0.5. The larger the Le is, the greater the mass transfer will be. As for the position effects, when the pollutant on the bottom wall moves to the right, the heat and mass transfer becomes worse. When the heat source on the left wall goes up, the mass transfer declines slightly. The best heat transfer occurs when the heat source is located in the middle of left wall.
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