Induced Pressure Fields of Power-law Fluids Electroosmotic Flow in Micro-diffuser at Different Angles

Juan Duan, Qing-Yong Zhu
2015 Procedia Engineering  
This paper describes the induced pressure of power-law fluids electroosmotic flow (EOF) in micro-diffuser at different angles such as 30° and 60°. Ostwald-De Wael model is used to describe the power-law fluids, and high accuracy compact difference algorithm is used to solve complete Poisson-Boltzmann equations and modified two-dimension Cauchy momentum equations. Poisson equation of pressure is solved by the velocity and pressure method. Dimensionless induced pressure nephogram and mean axial
more » ... am and mean axial velocity are shown in this study. While the diffuser angles is 30° or 60°, the impact of induced pressure is much more significant than that without pressure gradient. Dimensionless mean velocity profiles with induced pressure have a larger error than the situation without it. Shear thinning fluid is sensitive to the change of flow filed while shear thickening fluid is the opposite. For EOF in variable section, the influence of induced pressure should not be neglected. Especially for less viscous fluid such as shear thinning fluid, it has a larger error with induced pressure compared without it.
doi:10.1016/j.proeng.2015.11.277 fatcat:aitxca5n5bf3dese6nl3jmreb4