Assume that the two parallel plates in Problem15.1 are both stationary but that a constant pressure gradient exists in the flow direction (i. e., dp/dx = constant).

a. Obtain an expression for the variation of velocity between the plates.
b. Obtain an expression for the she ar stress on the plates in terms of dp/dx.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.