Consider the flow of oil (pr > > 1) in a tube. how will the hydrodynamic and thermal entrance lengths compare if the flow is laminar? a. the thermal entrance length will be much longer than the hydrodynamic entrance length. b. the thermal entrance length will be much shorter than the hydrodynamic entrance length c. the thermal entrance length and the hydrodynamic entrance length will be approximately equal.

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.