Influence of the Soret and Dufour effects on double-diffusive natural convection in a square cavity filled with magnetic fluid

• Main Authors: Yi-Xuan Lu, 盧毅軒
• Other Authors: Wen-Jeng Chang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/85306126823770485432

碩士 === 逢甲大學 === 機械與電腦輔助工程學系 === 104 === This study numerically investigated the influence of the Soret and Dufour effects on natural convection in a 2-D rectangular confined space filled with magnetic fluid. The ANSYS software program, FLUENT, was utilized for this purpose. The user-defined scalar (UDS) was employed to define the concentration equation, and the user-defined function (UDF) was adopted to compile the source term of the momentum equation, energy equation, and concentration equation. After the compilation, they were input into FLUENT for numerical simulation. The main parameters and their respective ranges of numerical simulation discussed in this paper are as follows: the Hartmann number (Ha) from 0 to 30, slant angle (φ) from 0° to 180°, Soret number (Sr) from −0.5 to 0.5, Dufour number (Df) from −0.5 to 0.5, buoyancy ratio (N) from −5 to 5, and aspect ratio (AR) from 0.5 to 5. The numerical simulation results showed that when (Ha) increased, the heat and mass transfer decreased. The average Nusselt number (Nu) and Sherwood number (Sh) reached their maxima at φ=60°. The average Nu and Sh reached their minima at φ=30°. When Sr increased, the average Sh increased; when Df increased, the average Nu increased. The average Nu and Sh reached their minima at N = −1. The average Nu and Sh reached their maxima when AR = 1.