作者
M.J. Prabhakar, R., Gadkari, S., Gopesh, T., Shaw
发表日期
2016
期刊
Journal of Rheology
卷号
60
期号
3
页码范围
345-366
简介
Entov and Hinch [J. Non-Newtonian Fluid Mech. 72, 31–53 (1997)] predicted a Weissenberg number of 2/3 during capillary thinning of slender filaments of polymer solutions. Data from the experiments of Clasen et al.[J. Rheol. 50, 849–881 (2006)] however show that that is not the case. The Weissenberg number is observed to systematically decrease with concentration in nominally dilute solutions to values well below the critical value of 1/2 for the coil-to-stretch transition to reach a minimum around the critical-overlap concentration c∗, and thereafter increase in semidilute solutions. Conformation dependence of the polymeric friction coefficient and the phenomenon of coil-stretch hysteresis are shown to play vital roles in determining capillary thinning dynamics. A key result is that when steady-state coil-stretch hysteresis exists, transient polymer conformations during capillary thinning evolve quasistatically along …
学术搜索中的文章
R Prabhakar, S Gadkari, T Gopesh, MJ Shaw - Journal of Rheology, 2016