Application of Lattice Boltzmann Method to Simulate the Low-Reyonold number power-law fluid Convective Heat Transfer problem

• Main Authors: Jheng-JhangJhu, 朱政彰
• Other Authors: Chao-Kuang Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/92769201072298626469

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 100 === While there is close relationship between non-Newtonian fluids and our poduction and living .Thus further study of non-newtonian fluid has great practical value. We know, there are a variety of fluid numerical simulation method for research, but the method using lattice Boltzmann for non-newtonian fluid problem hasn't caused wide spread concern. By simulating the general problems of backward-facing step fluids in industry. Then analyzing the properties of non-Newtonian fluids. In this paper with D2Q9 model to simulate a generalized non-Newtonian power-law backward-facing step fluids, we mainly used to study and analysis different types of flow phenomena among Newtonian fluids and shear thinning fluids and shear thickening fluids. Firstly, selecting a range of parameters like power-law index numbers, Reynold number, Prandtl number, and ER number. Then we can compare and analysis flow phenomena of shear thinning fluids and shear thickening fluids when the parameters changes . The built-in obstacle in channel include square cylinder, and the cylinder obstacle plays the role of causing interruption within the fluid field. The direction of fluid flow toward was changed by cylinder obstacle, and the recirculation region formed behind cylinder obstacle influence the fluid pass through. As mentioned above, heat transfer was different in local region. For choosing different power-law indexes causes the viscosity changed. And the flow phenomenon and variation of temperature become more complex.