高速振動平板間における高分子溶液の流れのマルチスケールシミュレーション(バイオ・マイクロ・スポーツの流れ分子スケール(2),一般講演)

概要

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The behavior of supercooled polymer melt composed of short chains with ten beads between rapidly oscillating plates is simulated by using a hybrid simulation of molecular dynamics and computational fluid dynamics. The flow profiles of polymer melt near an oscillating plate are quite different from those of Newtonian fluid. The viscous boundary layer of the melt is much thinner than that of the Newtonian fluid due to the shear thinning of the melt. Three different rheological regimes, i.e., the viscous fluid, viscoelastic liquid, and viscoelastic solid regimes, form over the oscillating plate according to the local Deborah numbers. The melt behaves as a viscous fluid when ωΤ^R≲1, and the crossover between the liquid-like and solid-like regime takes place around ωΤ^α≃1 (where ω is the angular frequency of the plate and Τ^R and Τ^α are Rouse and α relaxation time, respectively).
2009-09-02