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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 relate to the total film volume flow rate Q?


 

Pa Ha-0 Fully developed region Film b- P4.84

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