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The effect of turbulent clustering on particle reactivity
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 4
2017 (English)In: Proceedings of the Combustion Institute, ISSN 1540-7489, E-ISSN 1873-2704, Vol. 36, no 2, 2333-2340 p.Article in journal (Refereed) Published
Abstract [en]

The effect of turbulence on the heterogeneous (solid-fluid) reactions of solid particles is studied numerically with Direct Numerical Simulations (DNS). A simplified reaction system is used, where the solid-fluid reaction is represented by a single isothermal reaction step. It is found that, due to the clustering of particles by the isotropic turbulence, the overall reaction rate is entirely controlled by the turbulence for large Damkohler numbers. The particle clustering significantly slows down the reaction rate for increasing Damkohler numbers which reaches an asymptotic limit that can be analytically derived. This implies that the effect of turbulence on heterogeneously reacting particles should be included in models that are used in CFD simulations of e. g. char burnout in combustors or gasifiers. Such a model, based on the chemical and turbulent time scales, is here proposed for the heterogeneous reaction rate in the presence of turbulence.

Place, publisher, year, edition, pages
2017. Vol. 36, no 2, 2333-2340 p.
Keyword [en]
Turbulent reacting multiphase flow, Char oxidation, Clustering
National Category
Fluid Mechanics and Acoustics Energy Engineering
Identifiers
URN: urn:nbn:se:su:diva-141252DOI: 10.1016/j.proci.2016.06.187ISI: 000397458900078OAI: oai:DiVA.org:su-141252DiVA: diva2:1088468
Available from: 2017-04-12 Created: 2017-04-12 Last updated: 2017-04-12Bibliographically approved

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Mitra, Dhrubaditya
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