Download Capillary Surfaces: Shape - Stability - Dynamics, in by Dieter W. Langbein PDF

By Dieter W. Langbein

That includes a foreword by means of the astronaut Ulf Merbold, this publication is dedicated to interfaces among fluids, that's, among a liquid and a gasoline or among beverages. it's the first evaluate at the topic, delivering an updated assessment.

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Extra resources for Capillary Surfaces: Shape - Stability - Dynamics, in Particular Under Weightlessness (Springer Tracts in Modern Physics)

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This usually involves high losses on the latter side. Scattered troops are taken prisoner; to escape from the camps and to return to the correct side causes difficult logistical problems and is risky as well. Among the early studies of the dynamic contact angle, let us mention the papers by Friz [1921] dealing with complete wetting, by Hansen & Toong [1971] on the relationship to hydrodynamic forces, and several experimental papers by Dussan [1976, 1979], Dussan et al. [1974, 1982, 1991] and Chen et al.

Dussan [1976] has shown, however, that the flow distant from the contact line, where almost all fluid mechanical measurements are made, is quite insensitive to the form of these boundary conditions. This is a rather discouraging conclusion, since it indicates that the mechanism of motion of the contact line cannot be elucidated by macroscopic measurements. Here again, it is necessary to return to the microscopic, molecular description and to throw overboard the familiar concept that the fluid interface is a sharp interface.

This gives rise to thermal interface convection (also referred to as thermocapillary convection or Marangoni convection). That effect has been known since the 19th century and is attributed to Lord Rayleigh and to Marangoni [1865, 1871]. If for any reason the interface tension along a fluid interface varies, a shear force from regions exhibiting low interface tension to regions exhibiting high interface tension results, which gives rise to a corresponding fluid flow. Marangoni convection is the reason why dirt particles move rapidly from the Fig.

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