Spout States in the Selective Withdrawal System

Details Spout States in the Selective Withdrawal System Spout States in the Selective Withdrawal System

2006-08-07

arxiv.org/abs/cond-mat/0608140v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

In selective withdrawal, fluid is withdrawn through a nozzle suspended above the flat interface separating two immiscible, density-separated fluids of viscosities $\nu_{upper}$ and $\nu_{lower} = \lambda \nu_{upper}$. At low withdrawal rates, the interface gently deforms into a hump. At a transition withdrawal rate, a spout of the lower fluid becomes entrained with the flow of the upper one into the nozzle. When $\lambda = 0.005$, the spouts at the transition are very thin with features that are over an order of magnitude smaller than any observed in the humps. When $\lambda = 20$, there is an intricate pattern of hysteresis and a spout appears which is qualitatively different from those seen at lower $\lambda$. No corresponding qualitative difference is seen in the hump shapes.

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