The planar elongation viscosity is one of the important properties on the processes for film formation and blow formation. In this study, a new technique to evaluate planar elongation viscosity for low viscous fluids is investigated. To generate the planar elongation flow, a rectangular cylinder piston with two-dimensional converging channel is pushed into a reservoir. The sample fluid is filled in the reservoir. The rectangular piston is inserted into the reservoir at a constant velocity by an electrical actuator. The fluid is pushed out through the two-dimensional converging channel in the piston. The elongation rate in the converging channel is a function of the velocity of the piston. The planar elongation stress is measured by the flow-birefringence method. The evaluated planar elongation viscosity of a Maxwell fluid is almost four times larger than shear viscosity and it shows this technique is appreciable accurately to evaluate the planar elongation viscosity.
Evaluation of Planar Elongation Viscosity for Low Viscous Fluids Using Two-Dimensional Converging Channel Piston Technique
- Views Icon Views
- Share Icon Share
- Search Site
Takahashi, T, & Shirakashi, M. "Evaluation of Planar Elongation Viscosity for Low Viscous Fluids Using Two-Dimensional Converging Channel Piston Technique." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 1: Symposia, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 1623-1626. ASME. https://doi.org/10.1115/FEDSM2007-37180
Download citation file: