Discussion shear thickening phenomenon of non-Newtonian fluids

• Main Authors: Hsu-Ching Chu, 朱旭清
• Other Authors: Hua-Yi Hsu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/5b968z

碩士 === 國立臺北科技大學 === 機電整合研究所 === 103 === In this work, we use Computational Fluid Dynamics (CFD) as our tool to discuss the major topic. It was known that shear thickening phenomenon can let the fluid flow slowly. First of all, it have to establish a 2-D single channel flow field. We set the X-direction as a periodic boundary and let the fluid can flow circularly, then let the length of flow field fix and change the height of it. When the height increased, the velocity of top flow field increased too. It is important to fix the ratio of height and velocity. If the ratio is fixed, the Reynolds number will fix too. There is Nowtonian fluid in this study and the simulation is a single channel analysis. It combines with the UDFs and changes the flow field. There are three terms in the UDFs, including Brownian motion, Hydrodynamic force and Wall potential. The three terms give the energy and lead to shear thickening phenomenon. The calculation method is SIMPLE (Semi-Implicit Method for Pressure-Linked Equation). Base on the result, when the height is shortest, the shear thickening phenomenon is obviously. At the same time, when the fraction of particle is dense, the shear thickening phenomenon is obviously too.