Abstract
Heat flux or thermal flux, sometimes also referred to as heat flux density or heat flow rate intensity is a flow of energy per unit area. In SI units, it is measured in [Wm-2]. Measurements of heat flux are usually derived from temperature measurements. Under a temperature gradient the two thermocouples will be at different temperature and so register a voltage. The heat flux is proportional to this differential voltage. An effective way of measuring the heat flux in furnaces, boilers, ovens and similar other systems for combined convection and radiation mode of heat transfer by a heat pipe based heat flux sensor is described in this proposal. A cylindrical sensing element made out of Copper it is exposed to the heat source. The sensing element is insulated in the cylindrical surface so that one-dimensional heat conduction is ensured in the sensing element. By applying the Fourier law of heat conduction, the heat flux received by the sensing element can be evaluated at steady state by measuring the temperature difference between the two specific points in the sensing element. Since the sensing element is connected thermally to the heat pipe, the whole system will reach steady state in relatively short time duration.
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