Normal stress measurements for viscoelastic liquids using real time holographic interferometry of the Weissenberg effect
Abstract
Earlier theoretical research has shown that the shape of the free surface near a rotating rod depends on the geometry of the apparatus and the elastic properties of the liquid. Some experimental work is described in which holographic interferometry is used to measure small variations in the free surface shape for spherically and cylindrically symmetric geometries. These results were analyzed in terms of the above-mentioned theory to provide values of the two normal stress difference coefficients in the second order region of some simple viscoelastic liquids.
- Publication:
-
7th Australasian Conference on Hydraulics and Fluid Mechanics
- Pub Date:
- 1981
- Bibcode:
- 1981hfm..conf...47H
- Keywords:
-
- Holographic Interferometry;
- Stress Measurement;
- Viscoelasticity;
- Oils;
- Rotating Cylinders;
- Rotating Spheres;
- Silicones;
- Fluid Mechanics and Heat Transfer