Abstract
Non-Newtonian fluid flow in a channel obstructed by an antisymmetric array of cylinders has been studied by means of pressure loss measurements, flow visualization, and particle image velocimetry. The fluid used here are polyacrylamide 300ppm solution and Xanthan gum 800ppm solution, which show nearly same shear viscosity. In the case of PAM solution, pressure loss becomes very large compared with Xanthan gum solution, and the fluid cannot pass through the smaller gap between the cylinder and the wall. This fact may be due to high extensional viscosity of PAM solution.
