On the effective length of a short hot-wire sensor.

概要

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The effective length of a hot-wire sensor of an anemometer is shown to be shorter than its geometrical length by a factor around 2/3 if the nondimensionalized length is of order 3. This is due to the fact that the end regions of a hot-wire are not very sensitive to the wind speed. The analytic expression for the temperature distribution over a finite length hot-wire immersed across two regions of different wind-speed is numerically integrated and differentiated, to give the local wind-sensitivity of the wire. Then, assuming a sinusoidal distribution with the maximum at the center of the hot-wire for the spatial distribution of a velocity fluctuation, the sensitivity of the hot-wire as a whole to such a velocity fluctuation is calculated, giving the above referred results.
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