Publication detail

THE HEAT TRANSFER COEFFICIENT AT DISCONTINUED WATER SPRAY COOLING

HRABOVSKÝ, J. CHABIČOVSKÝ, M. ASTROUSKI, I. KOTRBÁČEK, P.

Original Title

THE HEAT TRANSFER COEFFICIENT AT DISCONTINUED WATER SPRAY COOLING

English Title

THE HEAT TRANSFER COEFFICIENT AT DISCONTINUED WATER SPRAY COOLING

Type

conference paper

Language

en

Original Abstract

Cooling by water sprays is widely used in heat treatment and other metallurgical processes to control the process temperature. Water spray cooling is used statically (without movement of the spray nozzles relative to the cooled object) or dynamically (with the movement). The static regime is typical for quenching systems intended for heat treatment of fixed steel plates. The dynamic regime is used in steel treatment processes such as rolling and finishing in mills. The movement of the steel plate relative to the fixed cooling section causes non-homogeneous distribution of water on the surface of the steel plate. The variability of the cooling section length, position of water nozzles and non-homogeneity of water distribution lead to non-uniform and distorted cooling conditions. Thus it is an important issue to define the impact of these parameters on cooling intensity and the heat transfer coefficient during the cooling process of steel plates. Heat treatment of hightemperature steel is held without protective atmosphere and is accompanied by growth of different oxides on the steel plate surface as well. The layer of oxides significantly affects the cooling regime and intensity. The influence of the oxide scales on the cooling intensity was studied experimentally and by numerical modeling for different cooling regimes. Experiments were conducted for static and dynamic regimes on surfaces with different rate of oxides layer. Prepared numerical analysis simulates the process with different conditions of the cooling section and samples with different oxide scale layers. Results obtained by numerical simulation approved the impact of the oxide layer on the cooling intensity and shown different character in the static and the dynamic regime.

English abstract

Cooling by water sprays is widely used in heat treatment and other metallurgical processes to control the process temperature. Water spray cooling is used statically (without movement of the spray nozzles relative to the cooled object) or dynamically (with the movement). The static regime is typical for quenching systems intended for heat treatment of fixed steel plates. The dynamic regime is used in steel treatment processes such as rolling and finishing in mills. The movement of the steel plate relative to the fixed cooling section causes non-homogeneous distribution of water on the surface of the steel plate. The variability of the cooling section length, position of water nozzles and non-homogeneity of water distribution lead to non-uniform and distorted cooling conditions. Thus it is an important issue to define the impact of these parameters on cooling intensity and the heat transfer coefficient during the cooling process of steel plates. Heat treatment of hightemperature steel is held without protective atmosphere and is accompanied by growth of different oxides on the steel plate surface as well. The layer of oxides significantly affects the cooling regime and intensity. The influence of the oxide scales on the cooling intensity was studied experimentally and by numerical modeling for different cooling regimes. Experiments were conducted for static and dynamic regimes on surfaces with different rate of oxides layer. Prepared numerical analysis simulates the process with different conditions of the cooling section and samples with different oxide scale layers. Results obtained by numerical simulation approved the impact of the oxide layer on the cooling intensity and shown different character in the static and the dynamic regime.

Keywords

Numerical simulation, heat flux, heat transfer coefficient, oxide layer, water spray cooling

RIV year

2015

Released

03.06.2015

Publisher

TANGER

Location

Ostrava

ISBN

978-80-87294-58-1

Book

METAL 2015, 24rd International Conference on Metallurgy and Materials, Conference Proceedings

Pages from

1

Pages to

6

Pages count

6

BibTex


@inproceedings{BUT114830,
  author="Jozef {Hrabovský} and Martin {Chabičovský} and Ilya {Astrouski} and Petr {Kotrbáček}",
  title="THE HEAT TRANSFER COEFFICIENT AT DISCONTINUED WATER SPRAY COOLING",
  annote="Cooling by water sprays is widely used in heat treatment and other metallurgical processes to control the
process temperature. Water spray cooling is used statically (without movement of the spray nozzles relative
to the cooled object) or dynamically (with the movement). The static regime is typical for quenching systems
intended for heat treatment of fixed steel plates. The dynamic regime is used in steel treatment processes
such as rolling and finishing in mills. The movement of the steel plate relative to the fixed cooling section
causes non-homogeneous distribution of water on the surface of the steel plate. The variability of the cooling
section length, position of water nozzles and non-homogeneity of water distribution lead to non-uniform and
distorted cooling conditions. Thus it is an important issue to define the impact of these parameters on cooling
intensity and the heat transfer coefficient during the cooling process of steel plates. Heat treatment of hightemperature
steel is held without protective atmosphere and is accompanied by growth of different oxides on
the steel plate surface as well. The layer of oxides significantly affects the cooling regime and intensity. The
influence of the oxide scales on the cooling intensity was studied experimentally and by numerical modeling
for different cooling regimes. Experiments were conducted for static and dynamic regimes on surfaces with
different rate of oxides layer. Prepared numerical analysis simulates the process with different conditions of
the cooling section and samples with different oxide scale layers. Results obtained by numerical simulation
approved the impact of the oxide layer on the cooling intensity and shown different character in the static and
the dynamic regime.",
  address="TANGER",
  booktitle="METAL 2015, 24rd International Conference on Metallurgy and Materials, Conference Proceedings",
  chapter="114830",
  howpublished="electronic, physical medium",
  institution="TANGER",
  year="2015",
  month="june",
  pages="1--6",
  publisher="TANGER",
  type="conference paper"
}