3 years ago

Microfluidic pump driven by anisotropic thermophoresis.

Zihan Tan, Marisol Ripoll, Mingcheng Yang

Microchannels with boundary walls at different temperatures and in between tilted elongated pillars are here shown to effectively behave as microfluidic pumps. The driving force for this fluid motion arises from the anisotropic thermophoretic effect of the elongated pillars that generates a force parallel to the walls, and perpendicular to the temperature gradient. The force is not determined by the thermophilic or thermophobic character of the obstacle surface, but by the geometry and the thermophoretic anisotropy of the obstacle. Via mesoscale hydrodynamic simulations, we investigate the pumping properties of the device as a function of the channel geometry, and pillar surface properties. Applications as fluidic mixers, and fluid alternators are also outlined, together with the potential use of all these devices to harvest waste heat energy.

Publisher URL: http://arxiv.org/abs/1808.05028

DOI: arXiv:1808.05028v1

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