Publication detail

Influence of impact angle and pressure on spray cooling of vertically moving hot steel surfaces

HNÍZDIL, M. CHABIČOVSKÝ, M. RAUDENSKÝ,M.

Original Title

Influence of impact angle and pressure on spray cooling of vertically moving hot steel surfaces

English Title

Influence of impact angle and pressure on spray cooling of vertically moving hot steel surfaces

Type

abstract

Language

en

Original Abstract

Cooling of vertically moving strips is used very often to obtain the required material properties. Water spray cooling has to be used when the high cooling intensity is needed. The water impacting on the strip surface is reflected and falls down between water nozzles and strip surface. This falling water has a significant influence on cooling intensity and also on cooling homogeneity. It causes undesirable problems with strip deformation and controllability of cooling. A water knife is used to reflect falling water out from the area between strip surface and water nozzles. Water knife is formed by row of flat jet nozzles has also cooling effect on the moving steel strip. This effect was studied and measured. Heat Transfer and Fluid Flow Laboratory is equipped with testing device which allows vertical movement of a heated experimental plate (sheet). Three different size of flat jet nozzles were tested with different water pressure (water flow rate) and angle of water impact (inclination angle of spraying bar). Water pressure range was between 2 and 8 bar and angle of water impact was changing from 20 to 40C. Dependence of heat transfer coefficient on surface temperature was evaluated for each experiment. Interesting results were obtained from comparison of these experiments results and showed that water pressure (flow rate) and also water impact angle has significant influence on the cooling intensity.

English abstract

Cooling of vertically moving strips is used very often to obtain the required material properties. Water spray cooling has to be used when the high cooling intensity is needed. The water impacting on the strip surface is reflected and falls down between water nozzles and strip surface. This falling water has a significant influence on cooling intensity and also on cooling homogeneity. It causes undesirable problems with strip deformation and controllability of cooling. A water knife is used to reflect falling water out from the area between strip surface and water nozzles. Water knife is formed by row of flat jet nozzles has also cooling effect on the moving steel strip. This effect was studied and measured. Heat Transfer and Fluid Flow Laboratory is equipped with testing device which allows vertical movement of a heated experimental plate (sheet). Three different size of flat jet nozzles were tested with different water pressure (water flow rate) and angle of water impact (inclination angle of spraying bar). Water pressure range was between 2 and 8 bar and angle of water impact was changing from 20 to 40C. Dependence of heat transfer coefficient on surface temperature was evaluated for each experiment. Interesting results were obtained from comparison of these experiments results and showed that water pressure (flow rate) and also water impact angle has significant influence on the cooling intensity.

Keywords

impact angle, pressure, heat transfer coefficient

Released

13.11.2013

Publisher

Institute of Metals and Technology

Location

Ljubljana, Slovenija

ISBN

978-961-92518-6-7

Book

Program and book of abstracts, 21th Conference on Materials and Technology

Edition number

21

Pages from

85

Pages to

85

Pages count

1

URL

Documents

BibTex


@misc{BUT112527,
  author="Milan {Hnízdil} and Miroslav {Raudenský} and Martin {Chabičovský}",
  title="Influence of impact angle and pressure on spray cooling of vertically moving hot steel surfaces",
  annote="Cooling of vertically moving strips is used very often to obtain the required material properties. Water spray cooling has to be used when the high cooling intensity is needed. The water impacting on the strip surface is reflected and falls down between water nozzles and strip surface. This falling water has a significant influence on cooling intensity and also on cooling homogeneity. It causes undesirable problems with strip deformation and controllability of cooling. A water knife is used to reflect falling water out from the area between strip surface and water nozzles. Water knife is formed by row of flat jet nozzles has also cooling effect on the moving steel strip. This effect was studied and measured.
Heat Transfer and Fluid Flow Laboratory is equipped with testing device which allows vertical movement of a heated experimental plate (sheet). Three different size of flat jet nozzles were tested with different water pressure (water flow rate) and angle of water impact (inclination angle of spraying bar). Water pressure range was between 2 and 8 bar and angle of water impact was changing from 20 to 40C.
Dependence of heat transfer coefficient on surface temperature was evaluated for each experiment. Interesting results were obtained from comparison of these experiments results and showed that water pressure (flow rate) and also water impact angle has significant influence on the cooling intensity.",
  address="Institute of Metals and Technology",
  booktitle="Program and book of abstracts, 21th Conference on Materials and Technology",
  chapter="112527",
  howpublished="electronic, physical medium",
  institution="Institute of Metals and Technology",
  year="2013",
  month="november",
  pages="85--85",
  publisher="Institute of Metals and Technology",
  type="abstract"
}