Error analysis of flow measurements with X-type Hot-film and a method of correction

Abstract

Measurements with X-type Hot-film anemometers inherently involve errors caused by an overheat-ratio, Reynolds number and the length-to-diameter ratio. In this study, the influence of the overheatratio and the Reynolds number on a cooling factor k was investigated experimentally. It was found that the cooling factor k is not affected by the overheat-ratio in a range of 1.03 to 1.05, and the Reynolds number in a range higher than 15.2. The cooling factor k is affected only by the length-to-diameter ratio. The cooling factor k decreases with increasing the length-to-diameter ratio.