1. L. Lees, “Convective heat transfer with mass addition and chemical reactions,” Third Combustion and Propulsion Colloquium, AGARD, NATO, Palermo, Sicily (March, 1958).
2. Cf. D. B. Spalding,Some Fundamentals of Combustion(Academic Press, Inc., New York, 1955), p. 57. This expression arises from the following two considerations: (i) mass efflux of materialAfrom the wall is convected and diffused away normal to the surface; (ii) there is no net flow to the wall of the gasGin the boundary layer, so that convective and diffusive fluxes of gasGmust cancel.
3. We should like to thank the referee for pointing out that in this context the approximation δ(1−cA)∼δ0 is adequate, and substantially simplifies the result.