2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

A Higher-Order Approach to Fluid-Particle Coupling in Microscale Polymer Flows

B. Kallemov, G.H. Miller, D. Trebotich
Lawrence Livermore Natioanal Laboratory, US

microfluidics, nanofluidics, polymer flow, particle transport

Flows containing long-chain polymers are viscoelastic on macroscopic length scales, but in microscale and nanoscale flows hybrid fluid-particle approaches are more suitable. Such an approach would enable more complex predictive modeling, including polymer-wall interactions like adsorption and elution, and flow-induced damage. Our polymer model is a Kramers freely jointed chain subject to stochastic and drag forces, both conservatively coupled to the fluid. We present new work aimed at demonstrating that the order of accuracy of our algorithm, which combines discrete Navier-Stokes with discrete stochastic particle dynamics, is second order in the time step. This improvement to our previous lower-order algorithm makes our overall method amenable to acceleration and higher resolution by adaptive mesh refinement.

Nanotech 2008 Conference Program Abstract