Thermal gradients lead to macroscopic fluid motion if a confining surface is present along the gradient. This fundamental nonequilibrium effect, known as thermo-osmosis, is held responsible for particle thermophoresis in colloidal suspensions. A unified approach for thermo-osmosis in liquids and in gases is still lacking. Linear response theory is generalized to inhomogeneous systems, leading to an exact microscopic theory for the thermo-osmotic flow, showing that the effect originates from two independent physical mechanisms, playing different roles in the gas and liquid phases, reducing to known expressions in the appropriate limits. This theoretical approach, as well as the problem of the definition of the transport coefficient in bidimensional systems, is also studied from a numerical point of view, exploiting the Molecular Dynamics technique.

Thermo-Osmosis: Theory and Simulations / Zeno Filiberti , 2021. 33. ciclo, Anno Accademico 2019/2020.

Thermo-Osmosis: Theory and Simulations

filiberti zeno
2021-01-01

Abstract

Thermal gradients lead to macroscopic fluid motion if a confining surface is present along the gradient. This fundamental nonequilibrium effect, known as thermo-osmosis, is held responsible for particle thermophoresis in colloidal suspensions. A unified approach for thermo-osmosis in liquids and in gases is still lacking. Linear response theory is generalized to inhomogeneous systems, leading to an exact microscopic theory for the thermo-osmotic flow, showing that the effect originates from two independent physical mechanisms, playing different roles in the gas and liquid phases, reducing to known expressions in the appropriate limits. This theoretical approach, as well as the problem of the definition of the transport coefficient in bidimensional systems, is also studied from a numerical point of view, exploiting the Molecular Dynamics technique.
2021
thermo-osmosis, thermophoresis, nanofluides,mass transport, nonequilibrium thermodynamics.
Thermo-Osmosis: Theory and Simulations / Zeno Filiberti , 2021. 33. ciclo, Anno Accademico 2019/2020.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2115566
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