The illustration above (next column) shows a vane with a turning angle q that moves with a...

The illustration above (next column) shows a vane with a turning angle q that moves with a steady speed υc. The vane receives a jet that leaves a fixed nozzle with speed υ.

a. Assume edge effects associated with the ends of the cylinder can be neglected. Under this assumption, how long will it take (in hours) for the solute A concentration to reach 2.94 gmol/m3 at a depth of 0.40 cm from the surface of the cylinder?

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b. Repeat part (a) calculation for the case where “end effects” are not neglected—i.e., for two-dimensional diffusion. The radial position is 0.4 cm from the cylindrical surface, and the axial position is 1.0 cm from the end of the rod.