Two-fluid kinetic theory for dilute polymer solutions

S Singh, G Subramanian, S Ansumali - Physical Review E, 2022 - APS
Physical Review E, 2022APS
We provide a Boltzmann-type kinetic description for dilute polymer solutions based on two-
fluid theory. This Boltzmann-type description uses a quasiequilibrium based relaxation
mechanism to model collisions between a polymer dumbbell and a solvent molecule. The
model reproduces the desired macroscopic equations for the polymer-solvent mixture. The
proposed kinetic scheme leads to a numerical algorithm which is along the lines of the
lattice Boltzmann method. Finally, the algorithm is applied to describe the evolution of a …
We provide a Boltzmann-type kinetic description for dilute polymer solutions based on two-fluid theory. This Boltzmann-type description uses a quasiequilibrium based relaxation mechanism to model collisions between a polymer dumbbell and a solvent molecule. The model reproduces the desired macroscopic equations for the polymer-solvent mixture. The proposed kinetic scheme leads to a numerical algorithm which is along the lines of the lattice Boltzmann method. Finally, the algorithm is applied to describe the evolution of a perturbed Kolmogorov flow profile, whereby we recover the major elastic effect exhibited by a polymer solution, specifically, the suppression of the original inertial instability.
American Physical Society
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