The motion of a thin oil sheet under the steady boundary layer on a body

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Abstract
A solution is obtained for the motion of a thin oil sheet, of non-uniform thickness, under a boundary layer. The following points are deduced: (a) The oil flows in the direction of the boundary-layer skin-friction, except near separation, where the oil tends to indicate separation too early. These conclusions are independent of oil viscosity. (b) The effect of the oil flow on the boundary-layer motion is very small.The application of the results to the interpretation of oil-flow patterns is briefly considered.

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