Canonical distribution functions in polymer dynamics. (I). Dilute solutions of flexible polymers

Patrick Ilg, Iliya V. Karlin and Hans Christian Öttinger

Physica A: Statistical Mechanics and its Applications, 2002, vol. 315, issue 3, 367-385

Abstract: The quasi-equilibrium or maximum entropy approximation is applied in order to derive constitutive equations from kinetic models of polymer dynamics. It is shown in general and illustrated for an example how canonical distribution functions are obtained from the maximum entropy principle, how macroscopic and constitutive equations are derived therefrom and how these constitutive equations can be implemented numerically. In addition, a measure for the accuracy of the quasi-equilibrium approximation is proposed that can be evaluated while integrating the constitutive equations. In the example considered, it is confirmed that the accuracy of the approximation is increased by including more macroscopic variables. In steady elongational flow, it is found that more macroscopic variables need to be included above the coil-stretch transition to achieve the same accuracy as below.

Keywords: Reduced description; Constitutive equation; Kinetic theory; Closure approximation; FENE dumbbells; Polymer solutions; Constitutive relations; Computational methods in statistical physics and nonlinear dynamics (search for similar items in EconPapers)
Date: 2002
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:315:y:2002:i:3:p:367-385

DOI: 10.1016/S0378-4371(02)01017-8

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