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boundary slip


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A boundary condition used in fluid mechanics. When a liquid flows over the surface of a solid, and layers of liquid close to the solid are assumed to be stationary relative to the solid, this is called a no-slip boundary condition. Such an assumption is a good approximation for macroscopic flow but is not accurate at the molecular scale. When this assumption is not made a slip boundary condition occurs. Boundary slip causes the viscosity at the interface to be different from the viscosity in the bulk of the liquid.

Subjects: Physics.


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