title: Empirical correlations for axial dispersion coefficient and Peclet number in fixed-bed columns.
abstract: In this work, a new correlation for the axial dispersion coefficient was obtained using experimental data in the literature for axial dispersion in fixed-bed columns packed with particles. The Chung and Wen correlation, the De Ligny correlation are two popular empirical correlations. However, the former lacks the molecular diffusion term and the latter does not consider bed voidage. The new axial dispersion coefficient correlation in this work was based on additional experimental data in the literature by considering both molecular diffusion and bed voidage. It is more comprehensive and accurate. The Peclet number correlation from the new axial dispersion coefficient correlation on the average leads to 12% lower Peclet number values compared to the values from the Chung and Wen correlation, and in many cases much smaller than those from the De Ligny correlation.
authors.affiliation: Department of Engineering, Chemical Engineering Group, University of Kurdistan, Sanandaj, Iran.
authors.forename: Seyed Omid
authors.initials: SO
authors.lastname: Rastegar
authors.affiliation: Department of Chemical and Biomolecular Engineering, Ohio University, Athens, OH 45701, USA. Electronic address: gu@ohio.edu.
authors.forename: Tingyue
authors.initials: T
authors.lastname: Gu
mesh_terms: D000327:Adsorption; D002853:Chromatography, Liquid; D004058:Diffusion; D008962:Models, Theoretical
keywords: Adsorption; Axial dispersion coefficient; Empirical correlation; Liquid chromatography; Mass transfer; Peclet number