Dynamic self-organization in particle-laden turbulent channel flow

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Abstract

This chapter examines dynamic self-organization in particle-laden turbulent channel flow. Many flows of relevance to large-scale chemical processing involve solid catalyst particles at significant concentrations embedded in a carrying gas-flow. Control over the spatial distribution of these particles, especially its homogeneity, is essential in order to provide a chemical processing that is as complete and uniform as possible, that is consistent with modern environmental requirements and that does not constitute a strong safety hazard. This chapter analyzes the fundamental aspects turbulent riser-flow which contains large numbers of interacting particles. Particle-particle as well as particle-fluid interactions are also included in the chapter. These interactions and the flow-forcing are the source for the dynamic formation and destruction of large-scale coherent particle swarms in the flow. The basic scenario of this self-organization is established, and the dominant aspects of the resulting turbulence modulation are investigated. Large-eddy simulations with different subgrid models and large numbers of particles at a significant volume fraction and realistic mass load ratio indicate the development of a thinner boundary layer and an accumulation of particles near the walls. At an average volume fraction of ? 1.5% it is found that neglecting particle-particle interactions leads to an unphysical modulated flow.

Original languageEnglish
Title of host publicationEngineering Turbulence Modelling and Experiments 6
Subtitle of host publicationProcedings of the ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements; ETMM6, Sardinia, Italy, 23–25 May, 2005
EditorsW. Rodi
Place of PublicationAmsterdam
PublisherElsevier
Pages979-988
Number of pages10
ISBN (Print)9780080445441
DOIs
Publication statusPublished - 2005
Event6th Conference on Engineering Turbulence Modelling and Measurements (ETMM6), 23-25 May 2005, Sardinia, Italy - Sardinia, Italy
Duration: 23 May 200525 May 2005

Conference

Conference6th Conference on Engineering Turbulence Modelling and Measurements (ETMM6), 23-25 May 2005, Sardinia, Italy
CountryItaly
CitySardinia
Period23/05/0525/05/05

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