Improvement axial dispersion calculation in fibrous garnished fixed beds using the neural method

Authors

  • Djamel Hassani
  • Faouzi Didi
  • Salah Hanini
  • Kamel Daoud

DOI:

https://doi.org/10.54021/seesv5n1-005

Keywords:

fixed bed, porous media, axial dispersion, fibrous beds, neural networks, modeling

Abstract

To determine accurately the physical modeling of flow through porous media and / or in chemical reactors, especially in the field of low Reynolds numbers, it is essential to compute the coefficient of axial dispersion. In prior studies, we employed the neural method to compute axial dispersion within fixed beds with parallelepiped and spherical packings. In the present study we apply the same method of calculation on heterogeneous fixed beds with large anisotropy using data from Poirier and Trinh on fibrous beds. Such an investigation could be however very useful while one has the desire to predict the mixing process to characterize the axial dispersion in fixed beds of anisotropic particles andwhenexperimental measurements are not accessible and / or difficult to implement as for reactors and / or industrial complex porous media. To show also the robustness and applicability of this method, the calculation results obtained will be modeled using expressions similar to those proposed by Poirier and Trinh, so that we can compare our results with those obtained by these authors, under the same operating conditions. Furthermore, our study offers a comprehensive analysis encompassing all three examined fixed bed configurations, namely parallelepiped, spherical, and fibrous arrangements.

References

GRÄHS, L.E. Displacement washing of packed beds of cellulose fibbers. Part 1. Mathematical model, SvenskPapperstidning, v. 78, n. 12, p. 446-457, 1976.

HASSANI, D.; HANINI, S. Application of the neuronal method for calculating the axial dispersion in fixed beds of the spherical linings.Journal of Applied Sciences, v. 10,n. 10, p. 823-830, 2010. ISSN 1812-5654. DOI: 10.3923/

jas.2010.823.830.

HASSANI, D.; HANINI, S.; DAOUD, K.; MAURET, E.Application of the neuronal method for calculating the axial dispersion in the beds fixed of the linings parallelepipedic.Journal of Applied Sciences,v. 8, n. 19,p. 3.380-3.388, 2008. ISSN 1812-5654. DOI: 10.3923/jas.2008.3380.3388

JÄRVELÄINEN, M.; AHONEN, A.Experimental study of filter cake washing.KemianTeollisuus, v. 30, n. 4, 175-180, 1973.

LEE, P.F. Channelling and displacement washing of wood pulp fibre pads.Tappi Journal,v. 67, n. 11,p. 100-103,1984.

MAURET, E. Mesure des pertes de pression et de la dispersion axiale dans les matelas fibreux. Application au lavage des pâtes écrues en lits fixes épais. Thèse (Doctorat) – INPG, France 1995.

PELLETT, G.L. Longitudinal dispersion, intraparticle diffusion, and liquid-phase mass transfer during flow through multiparticle systems.Tappi Journal,v. 49, n. 2, p. 75-82, 1966.

POIRIER, N.A.; CROTOGINO, R.H.; DOUGLAS, W.J.M.Axial dispersion models for displacement washing of wood pulp: an experimental study.Journal of Pulp and Paper Science, v. 15, n. 1, p. 28, 1989.

POIRIER, N.A.; CROTOGINO, R.H.; DOUGLAS, W.J.M. Axial dispersion models for displacement washing of packed beds of wood pulp fibbers.Canadian Journal of Chemical Engineering,v. 66, n. 6, p. 936-944, 1988.

SHERMAN, W.R. Movement of a soluble material during the washing of a bed of packed solids.AIChE Journal,v. 10, n. 6, p. 855-860, 1964.

TRINH, D.T.; POIRIER, N.A.; CROTOGINO, R.H.; DOUGLAS, W.J.M. Displacement washing of packed beds of wood pulp fibres.Canadian Journal of Chemical Engineering, v. 66, p.936, n. 2, 1988.

TRINH, D.T.; POIRIER, N.A.; CROTOGINO, R.H.; DOUGLAS, W.J.M.Displacement washing of wood pulp-an experimental study. Journal of Pulp and Paper Science,v. 15, n. 1, p. 28-35, 1989.

Downloads

Published

2024-01-22

How to Cite

Hassani, D., Didi, F., Hanini, S., & Daoud, K. (2024). Improvement axial dispersion calculation in fibrous garnished fixed beds using the neural method. STUDIES IN ENGINEERING AND EXACT SCIENCES, 5(1), 83–96. https://doi.org/10.54021/seesv5n1-005