It emerges from the previous discussions of boundary-layer flows that the boundary conditions, i.e. the distributions of the outer velocities U(x) or u e(x) and the wall temperature T w(x) or the wall heat flux q w (x), determine the behaviour of the boundary layer. For example, it turned out that the position of the separation point was quite dependent on how much the velocity of the outer flow was decelerated. Furthermore, in the last chapter we showed that, for temperature dependent physical properties. cooling and heating affected the position of the separation point.
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