Motion of grains, droplets, and bubbles in fluid-filled nano-pores

Details Motion of grains, droplets, and bubbles in fluid-filled nano-pores Motion of grains, droplets, and bubbles in fluid-filled nano-pores

2001-05-05

arxiv.org/abs/cond-mat/0105112v1

Physics

Condensed Matter

Statistical Mechanics

REVTeX, to appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.64.021601

Molecular dynamics studies of nono-sized rigid grains, droplets and bubbles in nano-sized pores indicate that the drag force may have a hydrodynamic form if the moving object is dense and small compared to the pore diameter. Otherwise, the behavior is non-hydrodynamic. The terminal speed is insensitive to whether the falling droplet is made of liquid or a solid. The velocity profiles within droplets and bubbles that move in the pore are usually non-parabolic and distinct from those corresponding to individual fluids. The density profiles indicate motional shape distortion of the moving objects.

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