Question 5) Consider the annulus formed between a rod of radius �2 and a tube of radius �D. Find the velocity profile for the flow where the inner rod is rotated with speed Ω and simultaneously is pulled in the axial direction at a speed �F = �D, while the flow experiences an external constant pressure gradient of GH I applied in the direction of the rod axis.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater