Air at 20 ° C flows past a 800 mm long plate at a velocity of 45 m / s . If the surface of the plate is maintained at 30

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Air at 20 ° C flows past a 800 mm long plate at a velocity of 45
m / s . If the surface of the plate is maintained at 300 ° C ,
determine ( a ) the heat transferred from the entire plate length
to air taking into consider . ation both laminar and turbulent
portions of the boundary layer , ( b ) the percentage error if the
boundary layer is assumed to be turbulent from the leading edge of
the plate . Assume unit width of the plate . Take the properties of
air at 160 ° C as : k = 0.03638 W / mK , v = 30.08 x 10 m² / s , Pr
= 0.682 .