TY - JOUR
T1 - Long-time persistence of hydrodynamic memory boosts microparticle transport
AU - Seyler, Sean L.
AU - Pressé, Steve
N1 - Publisher Copyright:
© 2019 authors. Published by the American Physical Society.
PY - 2019/10
Y1 - 2019/10
N2 - In a viscous fluid, the past motion of an accelerating particle is retained as an imprint on the vorticity field, which decays slowly as t-3/2. At low Reynolds number, the Basset-Boussinesq-Oseen (BBO) equation correctly describes nonuniform particle motion, capturing hydrodynamic memory effects associated with this slow algebraic decay. Using the BBO equation, we numerically simulate driven single-particle transport to show that memory effects persist indefinitely under rather general driving conditions. In particular, when driving forces do not vary smoothly, hydrodynamic memory substantially lowers the effective transport friction. Remarkably, this enables coasting over a spatially uneven potential that otherwise traps particles modeled with pure Stokes drag. Our results provide direct physical insight into the role of particle-fluid coupling in nonequilibrium microparticle transport.
AB - In a viscous fluid, the past motion of an accelerating particle is retained as an imprint on the vorticity field, which decays slowly as t-3/2. At low Reynolds number, the Basset-Boussinesq-Oseen (BBO) equation correctly describes nonuniform particle motion, capturing hydrodynamic memory effects associated with this slow algebraic decay. Using the BBO equation, we numerically simulate driven single-particle transport to show that memory effects persist indefinitely under rather general driving conditions. In particular, when driving forces do not vary smoothly, hydrodynamic memory substantially lowers the effective transport friction. Remarkably, this enables coasting over a spatially uneven potential that otherwise traps particles modeled with pure Stokes drag. Our results provide direct physical insight into the role of particle-fluid coupling in nonequilibrium microparticle transport.
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U2 - 10.1103/PhysRevResearch.1.032003
DO - 10.1103/PhysRevResearch.1.032003
M3 - Article
AN - SCOPUS:85086302763
SN - 2643-1564
VL - 1
JO - Physical Review Research
JF - Physical Review Research
IS - 3
M1 - 032003
ER -