Journal
PHYSICAL REVIEW E
Volume 79, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.79.026301
Keywords
boundary layers; drag; microfluidics; radiation pressure; rotational flow; viscosity
Categories
Funding
- Biotechnology and Biological Sciences Research Council [BB/E022243/1] Funding Source: researchfish
- BBSRC [BB/E022243/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/E022243/1] Funding Source: Medline
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Boundary walls in microfluidic devices have a strong influence on the fluid flow and drag forces on moving objects. The Stokes drag force acting on a sphere translating in the fluid is increased by the presence of a neighboring wall by a factor given by Faxen's correction. A similar increase in the rotational drag is expected when spinning close to a wall. We use optical tweezers to confirm the translational drag correction and report the hitherto unmeasured rotational equivalent. We find that the corrections for the rotational motion is only required for particle-wall separations an order of magnitude shorter than that for the translational cases. These results are particularly significant in the use of optical tweezers for measuring viscosity on a picolitre scale.
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