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Convective drying of an individual iron ore pellet: Analysis with CFD
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8235-9639
Luleå University of Technology, Department of Engineering Sciences and Mathematics.ORCID iD: 0000-0002-1033-0244
LKAB.
LKAB.
2011 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 54, no 17-18, p. 3882-3890Article in journal (Refereed) Published
Abstract [en]

The objective of this paper is to model convective drying of an individual iron ore pellet placed in a free stream of air with the aim to clarify the different stages of drying. A numerical model taking into account capillary flow of liquid moisture and internal vapor flow is developed and implemented in a commercial available software for Computational Fluid Dynamics where also the flow around the pellet is simulated, yielding heat- and mass transfer coefficients as a function of position. A real pellet is optically scanned for its geometry and simulations of the drying are compared to experiments with very good agreement. The result clearly shows four stages of drying; (i) evaporation of liquid moisture at the pellet surface, (ii) surface evaporation coexisting with internal drying as the surface is locally dry, (iii) internal evaporation with completely dry surface and (iv) internal evaporation at boiling temperatures. A moisture front moving towards the core of the pellet will start to develop at the second drying stage and the results show that the front will have a non-symmetrical form arising from the surrounding fluid flow.

Place, publisher, year, edition, pages
2011. Vol. 54, no 17-18, p. 3882-3890
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-8841DOI: 10.1016/j.ijheatmasstransfer.2011.04.040ISI: 000292360500009Scopus ID: 2-s2.0-79958020111Local ID: 7645fef7-8843-4205-b4a1-67a3fdcff9e0OAI: oai:DiVA.org:ltu-8841DiVA, id: diva2:981779
Note
Validerad; 2011; 20110403 (stlu)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ljung, Anna-LenaLundström, T. Staffan

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