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STUDY OF THE INFLUENCE OF CONVECTIVE EFFECTS IN INCIDENT RADIATIVE HEAT FLUX DENSITY MEASUREMENT UNCERTAINTY

− This study describes the measurement uncertainty propagation of the incident radiative heat flux density quantity associated with different exposure conditions of the heat flux meter, taking into account the convective effects in reaction to fire tests. To accomplish this aim, considering the complexity and non-linearity of the applied mathematical models to perform the indirect measurement of the above mentioned quantity, the Monte Carlo method was applied. The use of this numerical approach allows to estimate the quality of the measurements within a high accuracy level and to evaluate deviations related with the GUM method since it provides an approximate solution for this specific metrological problem. The experimental examples presented concern to the reaction to fire testing (the room-corner test and the flooring radiant panel test) with different exposure conditions of the heat flux meter used, being the applied mathematical model described on each case and a sensitivity analysis of the input uncertainty contributions presented.