Abstract
If a bright, polished surface is covered with a thin layer of transparent liquid and viewed in monochromatic light, the thickness of the layer can be determined with high precision by counting interference fringes. By this means, the local rate of evaporation can be determined. If, for example, air is blowing past a suitable model in a wind tunnel, the mass-transfer coefficient can be determined from measurements of the rate of evaporation. Then the local skin friction can be determined by utilizing the analogy between mass transfer and skin friction. This method has previously been investigated at low speed and is now extended to supersonic flows. Further studies and experiments at Mach numbers 1.6 and 2.8 on a small flat plate wind-tunnel model in laminar flow are described. As with the earlier subsonic tests, agreements between experiment and theory is good.
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