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Temperature Measurement of Glowing Firebrands

Published in Fire Technology:https://doi.org/10.1007/s10694-018-0810-3
Pre-print available on ResearchGate:
Link
Researchers:
James L Urban, Michela Vicariotto, Derek Dunn-Rankin, Carlos Fernandez-Pello

In this project we measured the temperature of glowing firebrands in various air-flows (1-4 m/s) using Color Pyrometry and Infra-Red (IR) photography. The results show that the emissivity of the firebrand surface changes as it burns and the char is reduced to ash, which is then shed intermittently throughout the burning. This makes IR camera measurements more difficult as the emissivity must be dynamically compensated for.

Comparison between Infra-Red & Color Pyrometry

Comparison of firebrand surface temperature measurements at different times though out a test. It is observed that the effective emissivity of the firebrand changes with time.

Time evolution of a Firebrand

Time evolution of a sample test including image, temperature image, and temperature distribution of firebrand surface

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