Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7061380 | Journal of Non-Newtonian Fluid Mechanics | 2015 | 12 Pages |
Abstract
Kinematic fields illustrated by flow visualization reveal several different sizes of the corner-vortex, which are related to the relative contributions from the first normal stress difference (N1) and extensional stress throughout the geometry. Transitions from lip-to-corner vortex are related to the transition from shear-dominated to extension-dominated flows. Experimental data, for the Boger fluid on 4:1:4 contraction-ratio, are contrasted against numerical simulation results for a constant-shear-viscosity/extension-hardening FENE-CR model. Trends demonstrate qualitative agreement on epd and vortex activity, which also reveal an interesting interplay between N1 and extensional viscosity.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
M. Pérez-Camacho, J.E. López-Aguilar, F. Calderas, O. Manero, M.F. Webster,