Hot-wire anemometer with the modulated overheating ratio-an instrument for measuring non-isothermal flows

The paper presents the method for simultaneous measurements of flow velocity and the temperature of the medium, using a single wire probe operating in a constant-temperature system wherein the overheating ratio undergoes sine modulations. Theoretical bases for these measurements are presented here together with some examples of velocity and temperature distribution patterns in the temperature and velocity wake formed behind the hot wire used to provide a test environment for the proposed scheme.