SHEAR-FLOW-INDUCED DISTORTION OF THE DENSITY DISTRIBUTION AND TRANSITION FROM A STATIONARY TO AN INSTATIONARY NON-EQUILIBRIUM STATE OF A COLLOIDAL PARTICLE IN A TRAP

被引:0
作者
Fernandez, Lea [1 ]
Hess, Siegfried [1 ]
Klapp, Sabine H. L. [1 ]
机构
[1] Tech Univ Berlin, Inst Theoret Phys, Sekr EW 7-1,Hardenbergstr 36, D-10623 Berlin, Germany
来源
ATTI ACCADEMIA PELORITANA DEI PERICOLANTI-CLASSE DI SCIENZE FISICHE MATEMATICHE E NATURALI | 2023年 / 101卷 / 01期
关键词
DIFFUSION; POLYMERS; VARIABLES; EQUATION; MODELS;
D O I
10.1478/AAPP.1011A3
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The motion of a colloidal particle in a liquid, confined within an optical trap and subjected to a shear flow, is modeled as an overdamped harmonic oscillator in n dimensions. The first nobs components are associated with the observable variables, while the remaining nint = n - nobs components are treated as "internal" or auxiliary variables intended to model complex fluid behavior. Coupling between the components drives the system into a non-equilibrium state. The Smoluchowski equation for the positional density distribution function is used to derive relaxation equations for the relevant averages. Specific results are presented for a plane Couette flow and for the case nobs = 2 and nint = 1. The shear-flow-induced effects on the observable averages and on the deformation and preferential orientation of the density distribution are analyzed and compared with numerical data from Brownian Dynamics simulations. A transition from a stationary to a transient state, corresponding to a delocalization of the particle or an escape from the trap, is found when the shear rate of the imposed stationary flow exceeds a critical value.
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页数:32
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