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- W4380993140 abstract "Thermo-osmotic flow around a microparticle in a liquid is characterized by observing and analyzing the distribution of tiny particles, i.e., tracers, near the microparticle's surface. First, an optical trapping laser is used to localize the tracer motion along a circular path near the circumference of the microparticle. Then, upon creating an overall temperature gradient in the liquid, the tracers on the circular path, originally uniformly distributed, gather towards the hotter side of the microparticle, indicating a flow along the particle toward the hot. Analyzing the tracer distribution further, it is found that (i) the flow magnitude decreases with the distance from the surface, and (ii) changing the surface property of the microparticle results in a change in the flow magnitude. These show that the observed flow is a thermally induced slip flow along the microparticle's surface. Then, assuming a simple slip boundary condition for a fluid equation, we evaluate the magnitude of the slip coefficient based on two experimental data: (i) the thermophoretic velocity of the microparticle and (ii) the thermo-osmotic flow around the microparticle. The results of the two approaches are in quantitative agreement. They are also compared with those of theoretical models for a slip flow in existing studies." @default.
- W4380993140 created "2023-06-17" @default.
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- W4380993140 date "2023-06-13" @default.
- W4380993140 modified "2023-09-25" @default.
- W4380993140 title "Thermo-osmotic slip flows around a thermophoretic microparticle characterized by optical trapping of tracers" @default.
- W4380993140 doi "https://doi.org/10.48550/arxiv.2306.08207" @default.
- W4380993140 hasPublicationYear "2023" @default.
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