The Nature of the Boundary Layer The changes of velocity in an air stream at points close to a surface past which it is flowing have been calculated by Blasius and von Karman for the surfaces of a thin plate placed edgewise to the stream; and they have also been directly measured by Fage and Falkner close to the surfaces of an aerofoil, by means of an arrangement of minute pitot tubes, down to distances of a few thousands of an inch from the surface.
Pye, D.R. (1933), "The Principles of Air Cooling: A Correlation of the Problem of Design with Researches on the Boundary Layer", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 3, pp. 51-53. https://doi.org/10.1108/eb029661
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