A relationship between isothermal and adiabatic film cooling effectiveness has been derived. Data from the open literature have been used to validate this relationship. This effectively uncouples short duration techniques from the concept of isothermal effectiveness. Thus, it allows the experimenter the freedom to choose between steady-state and short duration techniques as a means of acquiring data. Once acquired, the data can be used in either approach. The criterion for choice thus becomes the rigor of the modeling of flow conditions. Reynolds numbers, Prandtl numbers, boundary layer parameters and temperature ratios have to be rigorously modeled if heat fluxes are to be accurate. Under these conditions, short duration techniques may provide greater flexibility.

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