Which of the following boundary conditions is NOT valid for laminar boundary layer flow over a flat plate along x-axis? y=δ,u=u∞ y=δ,∂u∂y=0 y=δ,∂2u∂y2=0 None of the above

Evaluate the boundary-layer shape factor, H.

I want the detailed solution to understand a question

4. Consider fully developed laminar flow in the annular space formed by two concentric cylinders with a pressure gradient, op/ax, and the inner cylinder stationary. Let r = Rand r = kR. Assuming that the velocity profile is given by u: [¹-( 7 )² + +(ma 1 R R² ap 4μ &x 1-k² In- In(1/k) R a) Obtain an expression for the location of the maximum velocity as a function of k. b) Compare the limiting case, k→ 0,with the corresponding expression for flow in a circular pipe. c) Determine the volume flow rate. d) Find an expression for the average velocity. e) Compare the limiting cases for the volume flow rate and average velocity, k →0, with the corresponding expression for flow in a circular pipe.