The heat loss characteristics of the hot-wire probes placed normal to a horizontal wind are examined experimentally in the wind-speed range from zero to 150 cm/sec. The reproducibility of the characteristics is clearly shown at extremely low wire Reynolds numbers to which neither the empirical relation due to Collis and Williams nor King's law is applicable. Based on the examination, a linearized constant temperature hot-wire anemometer is designed and constructed which generates a voltage output directly proportional to instantaneous wind-speed from nearly zero to 150 cm/sec. Using the anemometer, practical problems related to the directional response and the effect of the proximity of a wall to the wire upno the reading are examined. An estimation is also given of the effect of velocity reversal upon the reading.
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Michio Nishioka (1973) studied this question.