Dynamical slowdown of polymers in laminar and random flows.
Phys Rev Lett
; 97(11): 118301, 2006 Sep 15.
Article
en En
| MEDLINE
| ID: mdl-17025934
ABSTRACT
The influence of an external flow on the relaxation dynamics of a single polymer is investigated theoretically and numerically. We show that a pronounced dynamical slowdown occurs in the vicinity of the coil-stretch transition, especially when the dependence on polymer conformation of the drag is accounted for. For the elongational flow, relaxation times are exceedingly larger than the Zimm relaxation time, resulting in the observation of conformation hysteresis. For random smooth flows, hysteresis is not present. Yet, relaxation dynamics is significantly slowed down because of the large variety of accessible polymer configurations. The implications of these results for the modeling of dilute polymer solutions in turbulent flows are addressed.
Search on Google
Banco de datos:
MEDLINE
Asunto principal:
Polímeros
Tipo de estudio:
Clinical_trials
Idioma:
En
Año:
2006
Tipo del documento:
Article