Dynamics of bead formation, filament thinning and breakup in weakly viscoelastic jets
Name
McKinley_Dynamics of bead.pdf
Size
1.51 MB
Format
Adobe PDF
Checksum (MD5)
6331470dbc2afd59b4d37a933f85ce6b
Author(s)
Ardekani, Arezoo
Sharma, Vandana
McKinley, Gareth H
Date Issued
December 2010
Journal
Journal of Fluid Mechanics
Publisher
Cambridge University Press
Citation
ARDEKANI, A. M., V. SHARMA, and G. H. McKINLEY. Dynamics of Bead Formation, Filament Thinning and Breakup in Weakly Viscoelastic Jets. Journal of Fluid Mechanics 665 (December 6, 2010): 46-56.
Version
Author's final manuscript
Abstract
The spatiotemporal evolution of a viscoelastic jet depends on the relative magnitude of capillary, viscous, inertial and elastic stresses. The interplay of capillary and elastic stresses leads to the formation of very thin and stable filaments between drops, or to ‘beads-on-a-string’ structure. In this paper, we show that by understanding the physical processes that control different stages of the jet evolution it is possible to extract transient extensional viscosity information even for very low viscosity and weakly elastic liquids, which is a particular challenge in using traditional rheometers. The parameter space at which a forced jet can be used as an extensional rheometer is numerically investigated by using a one-dimensional nonlinear free-surface theory for Oldroyd-B and Giesekus fluids. The results show that even when the ratio of viscous to inertio-capillary time scales (or Ohnesorge number) is as low as Oh ~ 0.02, the temporal evolution of the jet can be used to obtain elongational properties of the liquid.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Abdul Latif Jameel Poverty Action Lab (Massachusetts Institute of Technology)
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1017/s0022112010004738
