Abstract
Abstract At the outset it may seem reasonable to expect that dust clouds from combustible nm-particle powders will exhibit extreme ignition sensitivities (very low MIEs) and extreme explosion rates (very high K St -values). However, there are two basic reasons why this is not necessarily the case. Firstly, complete transformation of bulk nm-particle powders into dust clouds consisting of well-dispersed primary particles is extremely difficult to accomplish, due to very strong inter-particle forces. Secondly, the extremely fast coagulation process in nm particle clouds of explosive mass concentrations would transform the primary particles in a well-dispersed cloud into much larger agglomerates within fractions of a second. The paper discusses these aspects in relation to recent published MIE data and K St -values for some nm powders.
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