Non-monotonic hydrodynamic lift force on highly-extended polymers near surfaces

Details Non-monotonic hydrodynamic lift force on highly-extended polymers near surfaces Non-monotonic hydrodynamic lift force on highly-extended polymers near surfaces

2011-03-17

arxiv.org/abs/1103.3517v1

Physics

Condensed Matter

Soft Condensed Matter

17 pages, 3 figures, includes supplemental material

Scientific paper

The hydrodynamic lift force that polymers experience near boundaries is known to be a crucial element when considering rheological flows of dilute polymer solutions. Here we develop theory to describe the hydrodynamic lift force on extended polymers flowing near flat surfaces. The lift force is shown to display a non-monotonic character increasing linearly with the distance to the wall $Z$ in the near-surface regime defined as $ZL$ we recover the well known far-field result in which the force decays as $Z^{-2}$. Our analytical theory has important implications in understanding adsorption, desorption, and depletion layers of highly extended objects in flow.

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