Abstract
In the present study, we report and discuss that an apparent slip on a wall of a microchannel has been observed with polymer solution flow. The aqueous solutions of polymer, which are non-Newtonian fluids, used in our experiments are anionic and nonionic ones, respectively. An aqueous solution of glycerin, which is Newtonian fluid, is also used for comparison. The wall of microchannel is made of two types of glass: normal glass and ITO(indium tin oxide)-coated glass. The ITO-coated glass is also transparent. The flow channel is constructed by having a glass plate and PDMS chip (silicone rubber) bonded. In the experiment of anionic polymer solution, the apparent slip was observed on the wall of normal glass, but not with the one of ITO-coated glass. For the nonionic polymer solution, the apparent slip was observed both on the normal and ITO-coated glasses. These phenomena are caused by the interaction between the polymer and the wall.
