Detail publikace

HEAT TRANSFER COEFFICIENTS BENEATH THE WATER COOLING NOZZLES OF A BILLET CASTER

ŠTĚTINA, J. KAVIČKA, F. MAUDER, T.

Originální název

HEAT TRANSFER COEFFICIENTS BENEATH THE WATER COOLING NOZZLES 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 blank 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 nozzles 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 nozzles 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 nozzles (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 nozzles. It simulates not only the movement, but also the surface of a blank - and for the necessary range of water flow in the operation and the casting speeds. The transfer phenomena beneath the water cooling nozzles are presented on a simulated temperature field for a real 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

19. 5. 2009

Nakladatel

Tanger s.r.o.

Místo

Ostrava

ISBN

978-80-87294-03-1

Kniha

Sborník konfernece

Edice

Tanger

Číslo edice

1

Strany od

22

Strany do

30

Strany počet

8

BibTex

@inproceedings{BUT29728,
  author="Josef {Štětina} and František {Kavička} and Tomáš {Mauder}",
  title="HEAT TRANSFER COEFFICIENTS BENEATH THE WATER COOLING NOZZLES OF A BILLET CASTER",
  booktitle="Sborník konfernece",
  year="2009",
  series="Tanger",
  number="1",
  pages="22--30",
  publisher="Tanger s.r.o.",
  address="Ostrava",
  isbn="978-80-87294-03-1"
}