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Unformatted text preview: 5 . 3 at 99 . ) ( = f : x V vx vx V vx V y 2 5 . 3 2 5 . 3 2 % 99 % 99 as grows layer boundary = = = Typically, this result is written non dimensionally as: x v x V x x x on based number s Reynold' where = Re Re . 5 % 99 We can also find: x w f x x V C x x Re 664 . 2 1 Re 664 . Re 7208 . 1 2 * = = = = Comment: At leading edge of a flat plate f C x gives this and ! In reality, the leading edge of an infinitely thin plate would have very large, but not infinite f C . The problem is that near the leading edge of a thin plate, the boundary layer equations are not correct and the Navier-Stokes equations are needed. Question: Why did the boundary layer approximation fail at x ?...
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