Flow straighteners consist of arrays of narrow ducts placed in a flow to remove swirl and other transverse (secondary) velocities. One element can be idealised as a square box with thin sides as shown below. Calculate the pressure drop across a box with L=22 cm and a= 2.7 cm, if air with free-stream velocity of Uo = 11 m/s flows though the straightener. Use laminar flat-plate theory and take µ= 1.85 x 10-5 and p = 1.177kg/m3 . %3D Pa.s

Elements Of Electromagnetics
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Flow straighteners consist of arrays of narrow ducts placed in a flow to remove swirl and other transverse
(secondary) velocities. One element can be idealised as a square box with thin sides as shown below.
Calculate the pressure drop across a box with L=22 cm and a= 2.7 cm, if air with free-stream velocity of
Uo = 11 m/s flows though the straightener. Use laminar flat-plate theory and take u = 1.85 x 10-5 Pa.s
and p = 1.177kg/m³ .
%3D
%3D
a
Uo
Figure 1: Flow across straighteners.
Transcribed Image Text:Flow straighteners consist of arrays of narrow ducts placed in a flow to remove swirl and other transverse (secondary) velocities. One element can be idealised as a square box with thin sides as shown below. Calculate the pressure drop across a box with L=22 cm and a= 2.7 cm, if air with free-stream velocity of Uo = 11 m/s flows though the straightener. Use laminar flat-plate theory and take u = 1.85 x 10-5 Pa.s and p = 1.177kg/m³ . %3D %3D a Uo Figure 1: Flow across straighteners.
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