Unformatted text preview: → μ ρ = − ∞ ∞ m 0.056 m/s) )(8 kg/m (997 ) 10 5 )( s kg/m 10 891 . ( Re Re 3 5 3 cr cr cr cr x x The thickness of the boundary layer at that location is obtained by substituting this value of x into the laminar boundary layer thickness relation, mm 0.4 m 00040 . ) 10 (5 m) 056 . ( 5 Re 5 Re 5 2 / 1 5 2 / 1 2 / 1 = = × = = → = cr cr cr x cr x x δ Therefore, the flow becomes turbulent after about 5 cm from the leading edge of the plate, and the thickness of the boundary layer at that location is 0.4 mm. V ∞ x cr Discussion When the flow becomes turbulent, the boundary layer thickness starts to increase, and the value of its thickness can be determined from the boundary layer thickness relation for turbulent flow. 725...
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 Fall '10
 Dr.DanielArenas
 Fluid Dynamics, Thermodynamics, Convection, Force, Mass, Aerodynamics, critical Reynolds number, 0.00040 m

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