期刊
JOURNAL OF FLUID MECHANICS
卷 973, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2023.718
关键词
capillary flows; wetting and wicking
We present a theoretical study of viscous slug motion inside a microscopically rough capillary tube, where pronounced stick-slip motion can emerge at slow displacement rates. By using an analogy with the motion of a pendulum inside a fluid-filled rotating drum, we show that the stick-slip motion transitions to steady sliding at high displacement rates. We characterize this crossover with a simple scaling relation and demonstrate the shift in dominant energy dissipation mechanisms within the system.
We present a theoretical study of viscous slug motion inside a microscopically rough capillary tube, where pronounced stick-slip motion can emerge at slow displacement rates. The mathematical description of this intermittent motion can be reduced to a system of ordinary differential equations, which also describe the motion of a pendulum inside a fluid-filled rotating drum. We use this analogy to show that the stick-slip motion transitions to steady sliding at high displacement rates. We characterize this crossover with a simple scaling relation and show that the crossover is accompanied by a shift in the dominant energy dissipation mechanisms within the system.
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