Motion of a sphere in an oscillatory boundary layer: an optical tweezer based study

Details Motion of a sphere in an oscillatory boundary layer: an optical tweezer based study Motion of a sphere in an oscillatory boundary layer: an optical tweezer based study

2006-08-11

arxiv.org/abs/cond-mat/0608281v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 4 figures, latex

Scientific paper

The drag forces acting on a single polystyrene sphere in the vicinity of an oscillating glass plate have been measured using an optical tweezer. The phase of the sphere is found to be a sensitive probe of the dynamics of the sphere. The evolution of the phase from an inertially-coupled regime to a purely velocity-coupled regime is explored. Moreover, the frequency dependent response is found to be characteristic of a damped oscillator with an effective inertia which is several orders of magnitude greater than that of the particle.

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