The velocity profile in the boundary layer can be approximately described by the statement which likewise satisfies the boundary conditions w x (y = 0) = 0; w x (y = δ) = w δ ; (∂w x /∂y) y =0 = 0 and...


The velocity profile in the boundary layer can be approximately described by the statement


which likewise satisfies the boundary conditions


wx(y = 0) = 0; wx(y = δ) = wδ; (∂wx/∂y)y=0 = 0 and (∂2wx/∂y2)y=0 = 0 .


Calculate the thickness of the boundary layer δ(x).


Hot air at 300 ◦C and a pressure of 0.01 MPa flows at a velocity of 10 m/s over a 1 m long, flat plate. What heat flow must be removed per m2 of the plate surface area if we want to maintain the plate temperature at 25 ◦C?


Given are kinematic viscosity ν1(p1
= 0.1 MPa, ϑm
= 162.5 ◦C) = 30.84 · 10−6
m2/s, the Prandtl number P r(ϑm
= 162.5 ◦C) = 0.687 and the thermal conductivity of air λ(ϑ = 162.5 ◦C) = 3.64 · 10−2
W/Km.



Nov 29, 2021
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