Two improved methods for low-speed hot-wire calibration

Abstract

Two improved methods for hot-wire anemometer calibration in the low-speed range (15-95 cm/s) are described: a laminar pipe-flow method, and a shedding-frequency method. For the laminar pipe-flow method the calibration is performed in the exit plane of a fully-developed laminar pipe flow. For the shedding-frequency method the shedding frequency of a parallel mode cylinder wake is measured; the velocity is then obtained from a continuous Strouhal-Reynolds number relationship. Calibration results from the present methods were compared with each other and with results from a commercially available calibration jet. The present methods were demonstrated as a simple, but accurate means for low-speed hot-wire calibration.