Analysis of Thermo-Fluid Flows of Nanofluids past a Porous Square Cylinder

• Main Authors: Yuan-Jhih Cheng, 鄭元誌
• Other Authors: Tswen-Chyuan Jue
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/826ref

碩士 === 國立虎尾科技大學 === 車輛工程系碩士班 === 104 === In this study, the use of computational fluid dynamics method explores a 2-dimension transient thermo-fluid flow fields of nanofluids past a porous square cylinder. Continuity equation, momentum equation and energy equation were solved based on the porous area described by Darcy-Brinkman-Forchheimer model.The physical parameters studied include inlet velocity, nanofluid volume fraction and porosity and permeability of porous media to understand their effects on the flow fields, temperature distributions and lift coefficient, drag coefficient. Results show that as the fluid fraction increases, the amplitude of lift coefficient increases also. In terms of drag coefficient result, the drag coefficient increases with the increase of nanofluid volume fraction. Compared with lift coefficient amplitude, the drag coefficient values are relatively small in the ranges of parameters studied in here. In observing the heat transfer results, the averaged Nusselt numbers on the heating surface present an increase trend as the increase of nanofluid volume fraction. It means the nanofluid can enhance heat transfer rate. Involving nanofluid and porous medium both factors in a study, where the interaction of both factors exists, both factors should be properly adjusted to improve the flow field and heat transfer efficiency.