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Unformatted text preview: The Turbulent Flat Plate Boundary Layer (Section 10-6, engel and Cimbala) The turbulent flat plate boundary layer velocity profile : The time-averaged turbulent flat plate (zero pressure gradient) boundary layer velocity profile is much fuller than the laminar flat plate boundary layer profile, and therefore has a larger slope u / y at the wall, leading to greater skin friction drag along the wall. Re x , cr = 5 10 5 Note: The vertical scale is exaggerated for clarity. We define the engineering critical Reynolds number: Re x < Re x , cr BL most likely laminar Re x > Re x , cr BL most likely turbulent w = u / y at y = 0 There are three common empirical relationships for the turbulent flat plate boundary layer velocity profile: The one-seventh-power law : The log law : Spaldings law of the wall : Quantities of interest for the turbulent flat plate boundary layer : Just as we did for the laminar (Blasius) flat plate boundary layer, we can use these expressions...
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- Fall '05