Publication detail

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

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

Original Title

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

English Title

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

Type

journal article in Web of Science

Language

en

Original Abstract

The cooling of vertically moving strips is used very often to obtain the required material properties. Water spray cooling has to be used when a high cooling intensity is needed. Our Heat Transfer and Fluid Flow Laboratory is equipped with a testing device which allows vertical movement of a heated experimental plate (sheet). Two different sizes of flat-jet nozzles were tested with different water pressures and angles of the water impact (inclination angles of the spraying bar). The water-pressure range was between 2 bar and 9.3 bar and the angle of the water impact changed from 20 deg to 40 deg. The dependence of the heat-transfer coefficient on the surface temperature was evaluated for each experiment. Interesting results were obtained from the comparison of these experimental results, showing that the heat-transfer coefficient and the Leidenfrost temperature increase with the increasing water pressure. Very interesting results were obtained during the tests with different inclination angles. The highest heat-transfer coefficient was obtained for the angle of 20 deg and the lowest value of the heat-transfer coefficient was obtained for the angle of 40 deg at the surface temperatures of around 200 degrese of Celsius.

English abstract

The cooling of vertically moving strips is used very often to obtain the required material properties. Water spray cooling has to be used when a high cooling intensity is needed. Our Heat Transfer and Fluid Flow Laboratory is equipped with a testing device which allows vertical movement of a heated experimental plate (sheet). Two different sizes of flat-jet nozzles were tested with different water pressures and angles of the water impact (inclination angles of the spraying bar). The water-pressure range was between 2 bar and 9.3 bar and the angle of the water impact changed from 20 deg to 40 deg. The dependence of the heat-transfer coefficient on the surface temperature was evaluated for each experiment. Interesting results were obtained from the comparison of these experimental results, showing that the heat-transfer coefficient and the Leidenfrost temperature increase with the increasing water pressure. Very interesting results were obtained during the tests with different inclination angles. The highest heat-transfer coefficient was obtained for the angle of 20 deg and the lowest value of the heat-transfer coefficient was obtained for the angle of 40 deg at the surface temperatures of around 200 degrese of Celsius.

Keywords

spray cooling, flat jet nozzles, impact angle, water impingement density, Leidenfrost temperature

RIV year

2015

Released

01.05.2015

Publisher

Insitute of Metals and Technology, Ljubljana, Slovenia

Location

LJUBLJANA SLOVENIJA

Pages from

333

Pages to

336

Pages count

4

URL

Documents

BibTex


@article{BUT114425,
  author="Milan {Hnízdil} and Martin {Chabičovský} and Miroslav {Raudenský}",
  title="Influence of the impact angle and pressure on the spray cooling of vertically moving hot steel surfaces",
  annote="The cooling of vertically moving strips is used very often to obtain the required material properties. Water spray cooling has to
be used when a high cooling intensity is needed.
Our Heat Transfer and Fluid Flow Laboratory is equipped with a testing device which allows vertical movement of a heated
experimental plate (sheet). Two different sizes of flat-jet nozzles were tested with different water pressures and angles of the
water impact (inclination angles of the spraying bar). The water-pressure range was between 2 bar and 9.3 bar and the angle of
the water impact changed from 20 deg to 40 deg.
The dependence of the heat-transfer coefficient on the surface temperature was evaluated for each experiment. Interesting
results were obtained from the comparison of these experimental results, showing that the heat-transfer coefficient and the
Leidenfrost temperature increase with the increasing water pressure. Very interesting results were obtained during the tests with
different inclination angles. The highest heat-transfer coefficient was obtained for the angle of 20 deg and the lowest value of the
heat-transfer coefficient was obtained for the angle of 40 deg  at the surface temperatures of around 200 degrese of Celsius.",
  address="Insitute of Metals and Technology, Ljubljana, Slovenia",
  chapter="114425",
  doi="10.17222/mit.2013.239",
  howpublished="print",
  institution="Insitute of Metals and Technology, Ljubljana, Slovenia",
  number="3",
  volume="49",
  year="2015",
  month="may",
  pages="333--336",
  publisher="Insitute of Metals and Technology, Ljubljana, Slovenia",
  type="journal article in Web of Science"
}