An oil is being pumped inside a 45.0-cm-diameter pipe at a Reynolds number of 1300. The oil density is 855 kg/m3 and the viscosi
ty is 2.1 × 10−1 Pa · s. (i) What is the velocity in the pipe? (ii) It is desired to maintain the same Reynolds number of 1300 and the same velocity as in part (i) using a second fluid with a density of 955 kg/m3 and a viscosity of 1.5 × 10−3 Pa · s. What pipe diameter should be used?
it tells you that the speed increases until about 20 seconds then keeps a steady pace for 20 seconds then the speed drops and stops at 55 seconds in the process.
