Question

Problem 10 Consider a cylinder falling inside a pipe that is filled with oil. The small space between the cylinder ant the pipe is lubricated with an oil film that has viscosity u. Pipe Derive a formula for the steady rate of descent of a cylinder with weight W, diameter d, and length l sliding inside a vertical smooth pipe that has inside diameter D. Assume that the cylinder is concentric with the pipe as it falls. Use the general formula to find the rate of descent of a cylinder 125 mm in diameter that slides inside a 125.1 mm pipe. The cylinder is 250 mm long and weighs 25 N. The lubricant is SAE 20W oil at 10°C a. Oil film b. Cylinder

Answer 1

Anawer 는 ipe d. rl oil oil <t \oc Rate of descent ‘e cdlindek ísn laut ePeeA o n dex sides aoon) uhie t = film) ,thickness

0,00 Calalate velooPie) W.t as (x16) - 5x5x 161 125x 3194806-X1δ 329-q descent 0-379 m1s Rate of thg de scent of a cyAE, de's