The influence of oxide scale on heat transfer during reheating of steel
2008 (English)In: Steel Research International, ISSN 1611-3683, Vol. 79, no 10, 765-775 p.Article in journal (Refereed) Published
The present work presents methodology and development of a mathematical model for prediction of the influence of oxide scale on heat transfer during reheating of steel in an industrial furnace. In this developed model, temperatures inside the steel billet were measured and with thermocouples at selected places and were collected by a water cooled computer that was traveling inside the slab. CFD is used to calculate the flow field inside of a furnace. The mass-transfer coefficient of the scale formation is obtained by solving the convection mass-diffusion equation across a boundary layer to the surface of a flat plate. A model for inverse heat conduction is employed to calculate the local surface temperature and heat flux on top of the growing oxide scale layer on a slab moving through a walking beam reheating furnace. By using the inverse method, the transient temperature and heat flux was firstly determined on the surface of the steel. During subsequent computations, the growth of the scale was calculated and the surface temperature of the oxide scale was extracted by using the Cauchy data from the previous calculations. The sensibility of the model on steel physical parameters is studied, and suitable parameters were obtained for heating a low carbon steel plate in the reheating furnace. Results show that the oxide scale layer should not be neglected in reheating models.
Place, publisher, year, edition, pages
2008. Vol. 79, no 10, 765-775 p.
Inverse heat conduction; Mass transfer; Oxide scale formation; Atmospheric temperature; Billets (metal bars); Carbon steel; Furnaces; Heat conduction; Heat exchangers; Heat flux; Heat transfer; Heating equipment; Heating furnaces; Industrial furnaces; Inverse problems; Mass transfer; Steel; Surface properties; Thermoanalysis; Cauchy datums; Developed models; Flat plates; Inverse heat conduction; Inverse heat conductions; Inverse methods; Local surfaces; Low carbon steel plates; Mass-transfer coefficients; Oxide scale formation; Oxide scales; Physical parameters; Reheating furnaces; Scale formations; Steel billets; Surface temperatures; Transient temperatures; Walking beams; Scale (deposits)
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-7807DOI: 10.2374/SRI08SP009ISI: 000261160100006ScopusID: 2-s2.0-55149120943OAI: oai:DiVA.org:kth-7807DiVA: diva2:12938
QC 20100823. Uppdaterad från Submitted till Published 20100823.2007-12-122007-12-122010-08-23Bibliographically approved