Turbulent dispersion coefficients in cyclone flow: An empirical approach

• Tipo: Artigo em Revista Científica Internacional
• Data: 1999

Autores

salcedo, rl (Autor) FEUP; coelho, ma (Autor) FEUP

Revista

Título: Canadian Journal of Chemical Engineering

Vol. 77

Páginas: 609-617

ISSN: 0008-4034

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 10 Citações

Outras Informações

ID Authenticus: P-001-3PK

Abstract (EN): Among the various theories available to predict cyclone collection efficiency, the finite diffusivity theory of Mothes and Loffler (1988) has been shown to give the best fit of the observed grade-efficiency curves. However, lack of knowledge on the dependence of the particles' turbulent dispersion coefficient with cyclone geometry, operating conditions and particle size has so far hindered the application of this theory for predictive purposes and for improved cyclone design. In this work, this theory is applied for predictive purposes, through the use of an empirical relation for the particles turbulent dispersion coefficient. The proposed relation is based on an analogy with turbulent dispersion in packed beds, and correlates the particle radial Peclet and Reynolds numbers. Laboratory-scale reverse-flow cyclones of previously unpublished geometries were built to test the applicability of the proposed relation. The Mothes and Loffler ( 1988) theory, when coupled with the proposed estimates of turbulent dispersion coefficients, is a powerful tool for predicting cyclone collection efficiency, short of using computational fluid dynamics tools.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9