Abstract
The flow behavior of polymer solutions among cylinders in a rectangular duct has been studied by means of pressure loss measurements, flow visualization and particle image velocimetry. Cylinders are located alternate position and there are narrow gap side and wide gap side. The fluids used here are polyacrylamide 300ppm solution and Xanthan gum 800ppm solution, which show nearly the same shear viscosity. In the case of PAM solution, pressure loss becomes very large compared with the case of Xanthan gum solution, and the former hardly pass through the narrow gap side. This fact may be due to high extensional viscosity of PAM solution. In addition, difference of flow pattern in z-direction is studied and three dimensionality of the flow is clarified.
