CFD simulations of dust dispersion in the 20 L vessel: Effect of nominal dust concentration |
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| Institution: | 1. Istituto di Ricerche sulla Combustione - Consiglio Nazionale delle Ricerche (IRC-CNR), Piazzale Tecchio 80, 80125 Napoli, Italy;2. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy;1. School of Chemical and Environmental Engineering, North University of China, Taiyuan, Shanxi 030051, PR China;2. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China;3. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China |
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| Abstract: | Measurements of flammability and explosion parameters for dust/air mixtures require uniform dispersion of the dust cloud inside the test vessel. In a previous work, we showed that, in the standard 20 L sphere, the dust injection system does not allow generation of a uniform cloud, but rather high gradients of dust concentration are established. In this work, we used a previously validated three-dimensional CFD model to simulate the dust dispersion inside the 20 L sphere at different dust nominal concentrations (and fixed dust diameter). Results of numerical simulations have shown that, as the dust nominal concentration is increased, sedimentation prevails and, thus, when ignition is provided, the dust is mainly concentrated at the vessel walls. |
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| Keywords: | Computational fluid dynamics 20 L bomb Turbulent flow field Dust dispersion Dust sedimentation Dust nominal concentration |
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