Orientational ordering and disordering of a simple dipolar fluid under shear flow

Autor:	G. N. Patey, J. Liam McWhirter
Rok vydání:	2002
Předmět:	Condensed matter physics Chemistry General Physics and Astronomy Pair distribution function Critical value Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Shear rate Simple shear Shear (geology) Fluid dynamics Physical and Theoretical Chemistry Shear flow Couette flow
Zdroj:	The Journal of Chemical Physics. 117:9016-9027
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1513361
Popis:	Nonequilibrium molecular dynamics simulations are performed for a simple dipolar fluid under planar Couette flow. Under this shear flow, the fluid’s spatial structure becomes distorted, and the pair distribution function is anisotropic. At low shear rates, the dipoles respond to this distortion by orientationally ordering along an axis where the fluid structure is most compressed, giving a shear-induced ferroelectric fluid state. At high shear rates above a critical value, the orientational order decreases. We argue that this disordering can be attributed to the onset of large fluctuations in the director’s orientation about the compression axis at the critical shear rate. We also observe the director can “hop” between “up” and “down” directions along the compression axis. These hops are fast and infrequent events.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e7ee3fd1e98d9261b9d906f1ef8d31d4 https://doi.org/10.1063/1.1513361 Zobrazit plný text záznamu