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A Flow Time Model for Melt-Cast Insensitive Explosive Process

Abstract : Diphasic flows of concentrated suspensions of melt-cast insensitive explosives exhibit particular rheology properties. In order to limit the handling of pyrotechnical products presenting a risk with respect to the mechanical and thermal shocks, a lot of works have been undertaken for many years in the civil engineering sector. The objective of this study is to propose a predictive model of the flow time of a concentrated suspension through a nozzle located at the bottom of a tank. Similarly to our industrial process, the suspension is made out of insensitive energetic materials and flows under gravity. Experimental results are compared to three models (Quemada, Krieger-Dougherty, and Mooney) predicting the viscosity of a suspension as a function of the solid volume fraction , the maximum packing density and the viscosity of the interstitial liquid. De Larrard's model is used to calculate . The value of viscosity measured for the pure liquid is near the one predicted by the Bernoulli theorem, where liquids are considered as incompressible and perfect. In the end, it turns out that the Quemada's model gives a fair agreement between predictions and experiments.
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Submitted on : Thursday, February 18, 2010 - 3:28:31 PM
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  • HAL Id : hal-00457829, version 1


Jean-Philippe Guillemin, Luc Brunet, Olivier Bonnefoy, Gérard Thomas. A Flow Time Model for Melt-Cast Insensitive Explosive Process. XI° Congrès de la Société Française de Génie des Procédés. Des réponses industrielles pour une société en mutation., Oct 2007, Saint Etienne, France. pp.ISBN=2-910239-70-5. ⟨hal-00457829⟩



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