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Contribution du rayonnement thermique aux explosions de poussières métalliques : analyse et expérimentations

Abstract : In this research program, it was intended to clarify the role of the heat exchanges by thermal radiation inside a dust flame. If this exchange mode were dominant (as compared to the standard heat transfer by thermal conduction), unknown explosion regimes may ensue, questioning the efficiency of the wellknown explosion mitigation techniques. According to recent studies, the implication of heat transfer by thermal radiation may lead to severe flame acceleration but the theoretical basis are fragile and such predictions do not seem to be supported by experimental evidence. Aluminum dust is a good candidate to study this problem because of the presence of solid residues and high combustion temperature. Experiments were performed to investigate these points which reveal different flame propagation regimes and, in particular, a severe flame acceleration when the particle loading is large enough. Another finding is that the standard Beer-Lambert law largely employed to represented the transmission of the thermal radiation through the dust cloud is not satisfactory. This work continues on the numerical side, coupling the Discrete Element Method and the Finite Differences to investigate the physics of such flames and propose new models.
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Christophe Proust. Contribution du rayonnement thermique aux explosions de poussières métalliques : analyse et expérimentations. Rapport Scientifique INERIS, 2017, 2016-2017, pp.46-47. ⟨ineris-01869666⟩

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