Question: Consider the smooth square 10 by 10 cm duct in Fig. P7.25, the fluid is air at 20°C and 1 atm, flowing at Vavg =

Consider the smooth square 10 by 10 cm duct in Fig. P7.25, the fluid is air at 20°C and 1 atm, flowing at Vavg = 24 m/s. It is desired to increase the pressure drop over the 1-m length by adding sharp 8-mm-long flat plates across the duct, as shown.
(a) Estimate the pressure drop if there are no plates.
(b) Estimate how many plates are needed to generate an additional 100 Pa of pressure drop.

Consider the smooth square 10 by 10

Square Duct L-8 mm 1-24 m/s

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