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class 14 new - External Flow: The Flat Plate in Parallel...

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Unformatted text preview: External Flow: The Flat Plate in Parallel Flow Chapter 7 Section 7.3 Subject to prescribed boundary conditions, numerical solutions to the momentum and energy equations yield the following results for important local boundary layer parameters : ( 29 ( 29 1/ 2 1/ 2- with / 0.99 at 5. 5.0 5 / R e , = = = = x x u u vx u 2 2 and / 0.332, d f d = = , 1/ 2 , 2 0.664Re / 2 x s x f x C u - = ( 29 ( 29 1/ 2 * *- with / / / / x s s y h q T T k T y k u vx dT d = = =- = = * 1/ 3 and / 0.332 Pr for Pr 0.6, dT d = = 1/ 2 1/ 3 0.332 Re Pr x x x h x Nu k = = 1/ 3 r and P t = Average Boundary Layer Parameters : 1/ 2 , 1.328 Re x f x C- = 1/ 2 1/ 3 0.664 Re Pr x x Nu = The effect of variable properties may be considered by evaluating all properties at the film temperature . Steel (AISI 1010) plates of thickness 6 mm and length L = 1 m on a side are cooled by atmospheric air of velocity u = 10 m/s and T = 20 o C in parallel flow. For an initial temperature of 300 o C, what is the rate of heat transfer from the plate? SCHEMATIC: Air T = 20 C...
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class 14 new - External Flow: The Flat Plate in Parallel...

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