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Develop the similarity forms of the boundary layer momentum and energy equations

ID: 1862694 • Letter: D

Question

Develop the similarity forms of the boundary layer momentum and energy equations for uniform flow past an inclined wall (Uinfinity (x) = Cxm) as shown in the following sketch: The exponent in the free-stream velocity m is related to the wedge total angle by m = beta/(2pi - beta). For the momentum equation in the boundary layer, using the Bernoulli's equation in the free stream, we obtain an estimate for the pressure gradient as 1/rho dPinfinity/dx = -Uinfinity dUinfinity/dx, where Uinfinity (x) = C xm. Thus, the momentum boundary layer effectively becomes Apply the similarity transformation and show that the above momentum equation simplifies to the following similarity equation (known as the Falkner-Skan equation, which is a generalization of the Blasius equation 2f''' + (m + 1)ff'' + 2m[1 - (f')2] = 0 Apply the same transformation to the energy equation and show that the corresponding similarity equation now becomes 2 theta '' + Pr(m + 1)f theta ' = 0 where theta = T - T0/T infinity - T0. Establish whether the angle of inclination has any effect on the boundary condition to be used in conjunction with the equation above.

Explanation / Answer

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