Experimental investigation of surface tension in Newtonian and non-Newtonian fluids with optical diffractometry

Mehrnaz Zargham; Ali-Reza Moradi; Ali Najafi

doi:10.1117/12.2026373

18 November 2013 Experimental investigation of surface tension in Newtonian and non-Newtonian fluids with optical diffractometry

Mehrnaz Zargham, Ali-Reza Moradi, Ali Najafi

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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785DN (2013) https://doi.org/10.1117/12.2026373
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

In this paper using an optical method based on diffraction phenomenon, we studied surface tension of fluids. Diffraction patterns of a laser beam diffracted from surface waves, induced by an external acoustic wave generator, provides information of the surface of fluids. This information, in turn, enables calculating an experimental dispersion relation and surface tension of fluids. Spherical and cylindrical surface waves on fluids are generated by sticking a long thin needle and a thin metal plate, respectively, to a loudspeaker. Turning on the generator, the needle (or metal plate) causes waves on the surface, which act as a diffraction grating to the incident laser beam. The experiment and analysis were performed for both Newtonian and non-Newtonian fluids. Distilled water was used as a Newtonian sample fluid, and polyacrylamide solution was used as a non-Newtonian one. Our results predict considerable differences between Newtonian and non-Newtonian fluids behavior in terms of their surface wave dispersion.

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Mehrnaz Zargham, Ali-Reza Moradi, and Ali Najafi "Experimental investigation of surface tension in Newtonian and non-Newtonian fluids with optical diffractometry", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785DN (18 November 2013); https://doi.org/10.1117/12.2026373

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KEYWORDS

Diffraction

Capillaries

Water

Liquids

Wave plates

Diffraction gratings

Metals

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