Analysis Of Two- And Three-particle Motion In A
Couette Cell
Author(s)
M. Popova, P. Vorobieff & M. Ingber
Abstract
We present an experimental investigation of the irreversibility of two and three
spherical particle interactions in shear flow. The experiment is performed in a
stratified two-dimensional fluid inside a Couette cell at a very low Reynolds
number. The particles are placed into the cell in well-characterized initial positions.
Their motion is driven by the inner wall of the cell that is repeatedly rotated
by the same angle clockwise and then counterclockwise. Nominally the flow
is completely reversible (if the particles do not come close to each other, they
return to their initial positions). Three types of particles are used with different
surface roughnesses. In two-particle interactions, the degree of irreversibility on
the macroscopic scale is found to be correlated with the average microscopic
roughness of the particles. Subsequently, we investigate three-particle interaction
and find an appreciably different behaviour, suggesting that forces in a multiparticle
system cannot be reduced to force-pairs between individual particles.
1 Introduction
Addition of a suspended phase (gas bubbles, particles, or droplets) to a fluid flow
appreciably complicates the challenge of predicting the flow, either theoretically
or numerically. In many modern applications, especially in the emerging areas
of micro- and nanoscale processing, the flow regime of most interest is
viscous, nonlinear shear suspension flow. It may occur during composite and
ceramic processing, production of semiconductors and magnetic storage media,
and encapsulation of electronic components. Viscous shear flows with particle
suspensions are also important in such earth, environmental, and planetary science
problems as transport of sediments, contaminants, and slurries, and secondary oil
recovery by hydraulic fracturing.
Keywords
Related Book
Other papers in this volume
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