Question
Consider a viscous film of liquid draining uniformly down the side of a vertical rod of radius a , as in Fig. P4.84. At some
Consider a viscous film of liquid draining uniformly down the side of a vertical rod of radius a, as in Fig. P4.84. At some distance down the rod the film will approach a terminal or fully developed draining flow of constant outer radius b, with vz = vz(r), vo = vr = 0. Assume that the atmosphere offers no shear resistance to the film motion. Derive a differential equation for vz, state the proper boundary conditions, and solve for the film velocity distribution. How does the film radius b relate to the total film volume flow rate Q?
Pa Ha-0 Fully developed region Film b- P4.84
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Fundamentals Of Momentum Heat And Mass Transfer
Authors: James Welty, Gregory L. Rorrer, David G. Foster
6th Edition
1118947460, 978-1118947463
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