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ŠTĚTINA, J. KAVIČKA, F. MAUDER, T.
Originální název
TRANSFER PHENOMENA BENEATH THE WATER COOLING JETS TRANSFER PHENOMENA BENEATH THE WATER COOLING JETS OF A BILLET CASTER
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
The accuracy with which the solidification and cooling of a continuously cast billet is investigated depends on the setting of the boundary conditions of the numerical model of the temperature field. An in-house numerical model of the 3D temperature field of a concast billet had been used. This model enables the analysis of the temperature field of the actual billet as it passes through the zero-, primary-, secondary- and tertiary-cooling zones i.e. through the entire caster. This paper deals with the derivation of transfer phenomena under the cooling jets of the secondary zone. These phenomena are expressed by the values of the heat transfer coefficients (HTCs). The dependences of these coefficients on surface temperature and other operational parameters must also be given. The HTCs beneath the jets are given by the sum of the forced convection coefficient and the so-called reduced convection coefficient corresponding to heat transfer by radiation. The definition of the boundary conditions is the most difficult part of the numerical and experimental investigation of the thermokinetics of this process. Regarding the fact that on a real caster, where there are many types of jets (with various settings) positioned inside a closed cage, it is practically impossible to conduct measurement of the real boundary conditions. Therefore, an experimental laboratory device was introduced in order to measure the cooling characteristics of the jets. It simulates not only the movement, but also the surface of a billet - and for the necessary range of water flow in the operation and the shift rates (i.e. casting speeds). The values of the HTCs are entered into the database of boundary conditions, from which the interpolation model establishes the relevant HTC beneath the jet for the calculated surface temperature, the operational water flow and shift rate. This approach represents a unique combination of experimental measurement in a laboratory with a numerical model for calculating non-linear boundary conditions beneath a cooling jet. The transfer phenomena beneath the water cooling jets will be presented on a simulated temperature field for a real concasting of a 150x150 mm steel billet under different operational conditions.
Klíčová slova
HEAT TRANSFER COEFFICIENTS, BILLET CASTER, NOZZLES
Autoři
ŠTĚTINA, J.; KAVIČKA, F.; MAUDER, T.
Rok RIV
2009
Vydáno
7. 7. 2009
Nakladatel
University of Victoria IESVic
Místo
Victoria, BC, Canada
ISBN
978-1-55058-404-2
Kniha
ISTP-20 Proceedings
Strany od
122
Strany do
129
Strany počet
8
BibTex
@inproceedings{BUT31175, author="Josef {Štětina} and František {Kavička} and Tomáš {Mauder}", title="TRANSFER PHENOMENA BENEATH THE WATER COOLING JETS TRANSFER PHENOMENA BENEATH THE WATER COOLING JETS OF A BILLET CASTER", booktitle="ISTP-20 Proceedings", year="2009", pages="122--129", publisher="University of Victoria IESVic", address="Victoria, BC, Canada", isbn="978-1-55058-404-2" }