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The Effect of Reynolds Number on Jet in Asymmetric Co-Flows: A CFD Study
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4455-9300
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-4916-9566
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-1033-0244
Luossavaara-Kiirunavaara AB, Kiruna SE-981 86, Sweden.
2018 (English)In: International Journal of Chemical Engineering, ISSN 1687-806X, E-ISSN 1687-8078, article id 1572576Article in journal (Refereed) Published
Abstract [en]

In rotary kilns in grate-kiln systems for iron ore pelletizing, a long and stable jet flame is needed to ensure a high quality of the pellets. The primary jet issuing from the nozzle interacts with two asymmetric co-flows creating a very complex flow. In order to better understand and eventually model this flow with quality and trust, simplified cases need to be studied. In this work, a simplified and virtual model is built based on a down-scaled kiln model established in a previous experimental work. The aim is to numerically study the jet development as a function of position and Reynolds number (Re). The numerical simulations are carried out with the standard k-ε model, and quite accurate velocity profiles are obtained while the centerline decays and spreading of the passive scalars are over predicted. The model is capable of predicting a Re dependency of the jet development. With increasing Re, the jet is longer while it generally decays and spreads faster resulting from the stronger shear between the jet and co-flows and the stronger entrainment from the recirculation zone. This recirculation found in the simulations restrain the momentum spreading in the spanwise direction, leading to a slower velocity spreading with higher Re. For further validation and understanding, more measurements in the shear layer and simulations with more advanced turbulence models are necessary

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2018. article id 1572576
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-71461DOI: 10.1155/2018/1572576ISI: 000449197900001Scopus ID: 2-s2.0-85056223095OAI: oai:DiVA.org:ltu-71461DiVA, id: diva2:1261069
Note

Validerad;2018;Nivå 2;2018-11-06 (johcin) 

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-12-05Bibliographically approved

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Teng, ZiyanLarsson, SofiaLundström, Staffan

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