Abstract
This paper presents the rheo-optical experimental result of flow through a small orifice. PEO 3000ppm and CTAB-NaSal water solutions are used as test fluids. Two laser beams having orthogonal planes with each other are exposed to the jet issuing out of the small orifice. Change of interference fringe means an anisotropy of the test fluid. CTAB-NaSal shows the anisotropy, which is thought to depend on the property of the test fluid. But the anisotropy is not detected clearly for PEO3000ppm water solution.
