In a wind tunnel of square section of side 80 mm, the inlet velocity is 30 m/s. At 0.3 m from inlet the displacement thickness is 1 mm. Determine the change in pressure between the sections. In a wind...

In a wind tunnel of square section of side 80 mm, the inlet velocity is 30 m/s. At 0.3 m from inlet the displacement thickness is 1 mm. Determine the change in pressure between the sections.

In a wind tunnel square section of side 0.305 m, the boundary layer thickness increases from 9.5 mm to 12.7 mm. At the first location, the velocity of air is 18.3 m/s. The static pressure is – 22.9 mm of water column (gauge). Assuming turbulent flow conditions and 1/7th power law velocity profile, determine the velocity at the second section. Also determine the change in static pressure.