Thermo-osmotic flow in thin films
Fluid Dynamics
2016-05-11 v1 Chemical Physics
Optics
Abstract
We report on the first micro-scale observation of the velocity field imposed by a non-uniform heat content along the solid/liquid boundary. We determine both radial and vertical velocity components of this thermo-osmotic flow field by tracking single tracer nanoparticles. The measured flow profiles are compared to an approximate analytical theory and to numerical calculations. From the measured slip velocity we deduce the thermo-osmotic coefficient for both bare glass and Pluronic F-127 covered surfaces. The value for Pluronic F-127 agrees well with Soret data for polyethylene glycol, whereas that for glass differs from literature values and indicates the complex boundary layer thermodynamics of glass-water interfaces.
Keywords
Cite
@article{arxiv.1601.05888,
title = {Thermo-osmotic flow in thin films},
author = {Andreas Bregulla and Alois Würger and Katrin Günther and Michael Mertig and Frank Cichos},
journal= {arXiv preprint arXiv:1601.05888},
year = {2016}
}
Comments
12 pages, 4 figures