Abstract
An experimental investigation was performed on the calibration of cylindrical hot-film sensors in aqueous NaCl solutions. The results are consistent with Kramers' law provided the Reynolds number exponent is reduced to 0.36 and correction is made for conduction to the quartz fiber backing. A modified King's law appears to provide a useful approximation to the usual Kramers' law for practical applications of hot-film sensors in flows of variable density. The modified King's law provides a simple method for estimating the magnitude of errors introduced when variable density effects are ignored in the velocity calibration of a hot-film sensor in saline solutions.
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