Question

Oil flows near a flat surface and some measurements of the oil velocity, u, parallel to the surface, at different heights, y, above the surface are obtained. At the surface y 0. After an analysis of the data, the lab technician reports that the velocity distribution in the range 0 < y < 0.1 ft is given by the equation u-0.81 + 9.2y + 4.1x 10зуз with u in ft/s when y is in ft a) Do you think this equation is correct? Explain. b) Assuming the equation is correct, find the shear stress acting on the surface c) Assuming the equation is correct, find the shear stress acting at.05 ft above the surface Answer a) (to be posted later) b) 1.84 lbfIft 5.94 lbf/ft
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