Publication detail

Study of Water Jets Collision of High Pressure Flat Jet Nozzles for Hydraulic Descaling

VOTAVOVÁ, H. POHANKA, M.

Czech title

Studie kolize vodních paprsků vysokotlakých trysek určených pro hydraulické odokujování

English title

Study of Water Jets Collision of High Pressure Flat Jet Nozzles for Hydraulic Descaling

Type

conference paper

Language

en

Original abstract

One of the most effective methods for descaling hot-rolled steel products is performed using high pressure flat jet nozzles. These descaling nozzles are arranged in rows in hot rolling mills and are set in such a way that each adjoining pair of nozzles creates an overlapping area of water jet streams. Good homogeneity of the pressure distribution over the width of the hot-rolled plate is often used as an indicator of quality of the homogeneity of descaling. The presented laboratory measurements examine one pair of adjoining nozzles with a particular focus on the pressure distribution in the overlapping area. This paper deals with one particular setting of a pair of descaling nozzles with zero offset angles for the jet streams. A measured pressure distribution and an outcome of an erosion test on an aluminum plate are presented and discussed. The erosion test shows that spots with higher pressures do not necessairly result in a higher amount of taken material during an erosion test. The erosion test differs from the expected outcome in such a way as to warrant a detailed discussion of this phenomenon with possible explanations outlined.

Czech abstract

Článek popisuje měření rozdělení impaktního tlaku a erozivního testu pro dvojici trysek s plochým vodním paprskem. Podrobně studuje oblast překryvu trysek a porovnává obě měření.

English abstract

One of the most effective methods for descaling hot-rolled steel products is performed using high pressure flat jet nozzles. These descaling nozzles are arranged in rows in hot rolling mills and are set in such a way that each adjoining pair of nozzles creates an overlapping area of water jet streams. Good homogeneity of the pressure distribution over the width of the hot-rolled plate is often used as an indicator of quality of the homogeneity of descaling. The presented laboratory measurements examine one pair of adjoining nozzles with a particular focus on the pressure distribution in the overlapping area. This paper deals with one particular setting of a pair of descaling nozzles with zero offset angles for the jet streams. A measured pressure distribution and an outcome of an erosion test on an aluminum plate are presented and discussed. The erosion test shows that spots with higher pressures do not necessairly result in a higher amount of taken material during an erosion test. The erosion test differs from the expected outcome in such a way as to warrant a detailed discussion of this phenomenon with possible explanations outlined.

Keywords in Czech

odokujování, válcování za tepla, okuje, distribuce tlaku, erozivní test, měření, kvalita povrchu

Keywords in English

descaling, hydraulic hot rolling, scales, pressure distribution, erosion, measurement, surface quality

RIV year

2015

Released

11.05.2015

Publisher

Institute of Theoretical and Applied Mechanics

Location

Svratka

ISBN

978-80-86246-42-0

ISSN

1805-8248

Book

ENGINEERING MECHANICS 2015 21st International Conference Engineering Mechanics 2015

Edition number

1

Pages from–to

354–355

Pages count

2

BIBTEX


@inproceedings{BUT114532,
  author="Helena {Votavová} and Michal {Pohanka},
  title="Study of Water Jets Collision of High Pressure Flat Jet Nozzles for Hydraulic Descaling",
  booktitle="ENGINEERING MECHANICS 2015
21st International Conference Engineering Mechanics 2015",
  year="2015",
  month="May",
  pages="354--355",
  publisher="Institute of Theoretical and Applied Mechanics",
  address="Svratka",
  isbn="978-80-86246-42-0",
  issn="1805-8248"
}