Author(s)

H. El-Sadi & N. Esmail

Abstract

Non-Newtonian fluid can be encountered in many applications of Microdevices. In this study, two-dimensional non-Newtonian simulations of a viscous micropump were performed. The viscous micropump consists of a rotating cylinder located eccentrically inside a microchannel. When the cylinder rotates, a net force is transferred to the fluid due to the unequal shear stresses on the upper and lower surfaces of the cylinder, thus causing the fluid to displace. Non-Newtonian fluid is predicted by Navier Stokes equations and proposed by a modified Bingham model to describe the fluid flow Keywords: micropump, non-Newtonian, Bingham model, eccentricity, bulk velocity, microchannel, Navier Stokes equation, shear stress. 1 Introduction Increasing efforts are being directed towards applying the technologies of microfluidic, to the development of micro-devices for a wide range of applications such as medical, biological and related technologies. The main advantage of MEMS, in addition to their small size, is the fact that the manufacturing costs are remarkably lower when compared to their bigger counterparts, due to the mass fabrication methods used to produce them. Micropumps are between the most developed of all MEMS devices, and have been executed into the mainstream (Voigt et al [1], Schomburg and Goll [2]). Micropumps are imperative components for distributing fluid and samples in microanalysis system. Positive displacement pumping is the most widespread method used in micropumps, on the other hand the actuation of the reciprocating diaphragm can be achieved by different principles such as piezoelectric,

Keywords

micropump, non-Newtonian, Bingham model, eccentricity, bulk velocity, microchannel, Navier Stokes equation, shear stress.