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Abstract

Experiments have indicated that Preston's surface pitot tube method for the measurement of turbulent skin friction in incompressible flows can be extended to cover flows with heat transfer. By evaluating the fluid properties at Eckert's intermediate temperature the resulting calibration formula corresponds with that obtained by Preston for the zero heat transfer case.

It is shown that the calibration formula for the Preston tube is relatively insensitive to the temperature at which fluid properties are evaluated. Because of this the choice of a reference temperature is not critical and for flows involving moderate heat transfer the isothermal calibration of the Preston tube may be used if fluid properties are evaluated at wall temperature.

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References

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Measurement of Turbulent Skin Friction by a Preston Tube in the Presence of heat Transfer

Abstract

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References