A device based on the principle of hot wire anemometry but which employs a fine, laser-heated thermocouple as its sensor, is described. Its steady-state thermal equilibrium as a function of gas stream velocity is analysed theoretically and calibrated experimentally. Transient behaviour is then studied from heating/cooling curves, derived from photographic records of oscilloscope traces, obtained by switching the laser on/off at various flow velocities. This allows calculation of thermal inertia and elucidates its trade off against robustness of the sensor.
Experiments in Fluids – Springer Journals
Published: Oct 25, 2003
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