Air at 20°C and 1 atm enters a 40-cmsquare duct as in Fig. P7.7. Using the displacement thickness concept of Fig. 7.4, estimate (a) The

Air at 20°C and 1 atm enters a 40-cmsquare duct as in Fig. P7.7. Using the €œdisplacement thickness€ concept of Fig. 7.4, estimate
(a) The mean velocity and
(b) The mean pressure in the core of the flow at the position x = 3 m.
(c) What is the average gradient, in Pa/m, in this section?

40 x 40 cm square duct Boundary layers 2 m/s Ucore