Augmentation du risque d’explosion de poussières sous l’effet du rayonnement thermique

Abstract : In the present work, the experimental means, the results and the theoretical interpretation are presented about the role of heat transfer by radiation through the front of a flame propagating in a gas-particle cloud. Methane-air clouds seeded with inert partciles are considered and aluminium dust air clouds. Thermal radiated fluxes and laminar burning velocities in laminar suspensions were measured may be for the first time. It is shown that the burning velocity can be increased thanks to the extra energy exchange provided by thermal radiation. The second important finding is that a spontaneous acceleration seems to be associated to such exchanges. Theoretical tools have a limited predictability mostly because of the heavily simplifying assumptions about the modelling of thermal radiation exchanges. Only a qualitative agreement is possible. A criterion based on a Boltzman number is proposed to identify situations were spontaneously accelerating flames are possible.
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Christophe Proust, Rim Ben Moussa, Mohamed Guessasma, Khashayar Saleh, Jérôme Fortin. Augmentation du risque d’explosion de poussières sous l’effet du rayonnement thermique. 16. Congrès de la Société Française de Génie des Procédés (SFGP 2017), Jul 2017, Nancy, France. ⟨ineris-01863199⟩

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