A generalised analysis of a local heat flux probe

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Abstract
A systematic study of the effects of heat flux probe design on its thermal characteristics and response is reported. The probe considered consists of a metallic film sensor deposited onto a substrate and covered by a thin protective coating. This study considers the case of a constant temperature sensor mounted in an isothermal wall with the sensor maintained at the wall temperature. A two-dimensional, transient numerical analysis for a dynamic heat flux probe was formulated and results reported. Asymptotic response limits were studied by considering idealised probe models and are presented. A non-dimensional relationship between steady-state heat transfer coefficient and sensor power was determined for a range of material properties for the substrate and coating. The steady-state effective probe area was found to remain essentially constant for a broad range of heat flux provided that the probe materials are chosen properly. Probe sensitivity was found to be dependent on probe design and material properties. The transient analysis demonstrated the effect of probe design on probe response and sensitivity.

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