A new criterion for end-conduction effects in hot-wire anemometry

The effect of end conduction on constant temperature hot-wire anemometry was studied. A new parameter, , is proposed to describe the significance of end conduction more comprehensively than the commonly used length-to-diameter ratio l/d, in that it allows for material property variations, resistance ratio and Reynolds number effects. Numerical and experimental data are used to show that Γ improves the correlation of the attenuation of measured turbulence fluctuations, and it is found that Γ > 14 is required to avoid such effects.