2329 複雑流体のマイクロチャネル内流れにおける速度分布計測(S42-6 複雑流体の流動現象(6),S42 複雑流体の流動現象)  [in Japanese] 2329 Velocity measurements in flows of complex fluids through a microchannel  [in Japanese]

Three dimensional velocity profiles of polymer solutions were directly measured in a microhannel with rectangular cross sections. The test fluids are 0.2 wt% aqueous solutions of polyacrylamide whose molecular weights are 6×10^6 (fluid L) an 1.9×10^7 (fluid H). The microchannel was made of PDMS and it is mounted on the glass plate. The velocity profiles in the width direction and in the depth direction were discussed. Consequently, for each test fluid, an apparent slip was observed on the PDMS wall. A slip layer is supposed to cause the apparent slip. This apparent slip on the PDMS wall significantly affects the velocity profile in the flow of polymer solution through a PDMS microchannel.