The mechanics of film cooling-Part 1

Thin liquid wall films flowing under the influence of high-velocity turbulent gas streams were studied for the purpose of obtaining an understanding of the mechanics of film cooling. Conditions which insure liquid-film attachment to solid surfaces without loss of unevaporated liquid to the gas stream when simple radial-hole injectors are used were found; the maximum allowable coolant flow rate for a stable coolant film was determined (a stable coolant film is obtained when no unevaporated coolant is entrained by the gas stream as the result of interfacial disturbances); and a method for calculating the evaporation rate and the surface temperature for a stable inert coolant film was found

Note on the calculation of transport properties of gas mixtures

As a result of recent theoretical studies on transport properties of gases by Hirschfelder, et al., and others, the dynamic viscosity (µ), the thermal conductivity (λ), and the mechanical diffusivity (D), as well as the dimensionless ratios Prandtl Number (Pr = C_p µ/λ, where C_p = specific heat at constant pressure), Schmidt Number (Sc =µ/ρD, where ρ = density), anq λ/ρC_pD may now be calculated rapidly and with a reasonable degree of accuracy both for pure gases and for mixtures of gases, provided that the temperature of the gases is not too low. This happy state of affairs does not seem to be realized by aeronautical engineers, and it is the purpose of the present note to call attention to it