LFPB Seminar: Experimental investigation of the connection between thermophoresis and thermo-osmosis

When a solid surface is exposed to the temperature gradient of fluids in contact, a cree-ping flow is induced along the surface. This thermal flow, often referred to as thermo-osmosis, plays an important role in micro- and nanoscale thermo-fluid mechanics. For in-stance, suspended particles in locally heated fluids are expected to move in the opposite direction of thermo-osmosis which is driven near the surfaces of particles. Such migrati-on of particles is known as thermophoresis and was investigated experimentally in Ref [1] by characterizing the thermo-osmosis along the surface of thermophoretic micropartic-les. In particular, flow evaluation using the optical trapping of tracers revealed the connection between thermophoresis and thermo-osmosis [1].

[1] T. Tsuji, et al., “Thermo-osmotic slip flows around a thermophoretic microparticle characterized by op-tical trapping of tracers”, Physical Review Applied 20 (5), 054061 (2023)