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221. Velocity profiles are measured at the upstream end (surface 1) and at the downstream end (surface 2) of a rectangular control volume, as shown in Fig. P2.21. If the flow is incompress- ible, two dimensional, and steady, what is the drag coefficient for the airfoil? The vertical di- mension H is 0.025c. The pressure is poo (a constant) over the entire surface of the control volume. (This is an extension of Problem 2.9.) 3)-r u=U, H 0.02501 Figure P2.21
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