2319 希薄高分子溶液中のヴィスコスフィンガリングの分岐現象(S42-4 複雑流体の流動現象(4),S42 複雑流体の流動現象)  [in Japanese] 2319 Bifurcation of Viscous Fingering in Dilute Polymer Solution  [in Japanese]

When air pushes a more viscous fluid in two parallel plates by a syringe pump, viscous fingering pattern have been observed. Water and aqueous glycerin solutions are used as Newtonian fluids. Polyacrylamide (Separan AP30) solutions and aqueous glycerin solutions adding polyacrylamide are used as non-Newtonian fluids. It was found that it showed the bifurcation of viscous fingering to be different by a kind of solution. And, it was found that the solution concentration, gap and air pressure influenced a bifurcation pattern. Furthermore, it was not found a large bifurcation pattern in dilute Polymer solution and aqueous glycerin solutions with lower concentration. Then, tip speed of bifurcation was low.