Abstract
We experimentally investigate effects of effective interfacial tension (EIT) on miscible viscous fingering (VF). To do so, we prepare two liquid systems in which the viscosity contrast is the same but EIT is different. We confirm that the viscosity contrast is the same in the both system but EIT is different by means of the measurement of viscosity and EIT. We also conduct diffusion experiment to confirm the Peclet number has no effect on the experiments. We perform VF experiment by using a Hele-Shaw cell. We find that the typical width of the fingers is larger for larger EIT system. This experimental result has a good agreement with recent numerical studies of the related issue.
