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Thermo-osmotic flows in closed channels.

Matteo Bessega1,2, Pietro Anzini1,2, Alberto Parola1,2

  • 1Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy.

The Journal of Chemical Physics
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Summary
This summary is machine-generated.

Thermal gradients drive fluid motion in confined spaces, a phenomenon called thermo-osmosis. Analytical models accurately predict this behavior in narrow channels, extending to the mesoscopic regime for realistic conditions.

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Area of Science:

  • Out of equilibrium statistical physics
  • Fluid dynamics
  • Nanoscale transport phenomena

Background:

  • Thermal forces are crucial in non-equilibrium statistical physics.
  • Confinement in nanochannels induces fluid motion via thermal gradients (thermo-osmosis).
  • Thermo-osmosis involves a coupling between mass flow and temperature gradients, described by Onsager coefficients.

Purpose of the Study:

  • Investigate the scaling of thermo-osmosis with channel width.
  • Validate analytical solutions against simulation data.
  • Determine the limits of linear response theory in thermo-osmotic systems.

Main Methods:

  • Nonequilibrium molecular dynamics simulations.
  • Development of analytical solutions based on linear response theory.
  • Analysis of pressure gradient and velocity profiles.

Main Results:

  • Analytical expressions accurately predict pressure and velocity profiles in narrow channels.
  • Linear response theory breaks down with increasing pore width due to non-linear energy transport.
  • The analytical solution remains consistent up to the mesoscopic regime for achievable thermal gradients.

Conclusions:

  • The study validates analytical models for thermo-osmosis in confined fluids.
  • Non-linear effects become significant in wider pores, necessitating advanced theoretical approaches.
  • The findings provide a foundation for understanding and manipulating fluid transport in nanoscale systems.