Publication detail

Descaling by Pulsating Water Jet

HNÍZDIL, M. RAUDENSKÝ, M.

Original Title

Descaling by Pulsating Water Jet

English Title

Descaling by Pulsating Water Jet

Type

conference paper

Language

en

Original Abstract

Descaling is the process when scales are removed by water jet. In Academy of science in Ostrava, they have patented device called pulsator which can add to the water some extra energy in the form of high-frequency pressure pulses which disintegrate flat water jet. This paper deals with a new study of removing scales using pulsations and its comparison with descaling process without pulsating water jet. There are two main factors the thermal shock and the impact pressure applied by the impinging water onto the surface. During cold rolling is important only impact pressure. The descaling by pulsating water jet was also tested on the sheets generally used during cold rolling, because pulses create very short pressure peaks in the impact area higher than 300 MPa. While during the descaling without pulses is impact pressure approximately 1 - 5 MPa. Heat transfer and descaling tests were performed on carbon steel plate and steel sheet with a high percentage of silicon. Just these scales are very difficult for removing from the surface. It was found out that the pulsations have influence on the heat transfer and removing scales from the hot surfaces of steel. Tests for descaling on the cold sheets showed that the scale layer is thinner for the case of pulsating water jet with comparison to the scale thickness after descaling by the non pulsating water jet.

English abstract

Descaling is the process when scales are removed by water jet. In Academy of science in Ostrava, they have patented device called pulsator which can add to the water some extra energy in the form of high-frequency pressure pulses which disintegrate flat water jet. This paper deals with a new study of removing scales using pulsations and its comparison with descaling process without pulsating water jet. There are two main factors the thermal shock and the impact pressure applied by the impinging water onto the surface. During cold rolling is important only impact pressure. The descaling by pulsating water jet was also tested on the sheets generally used during cold rolling, because pulses create very short pressure peaks in the impact area higher than 300 MPa. While during the descaling without pulses is impact pressure approximately 1 - 5 MPa. Heat transfer and descaling tests were performed on carbon steel plate and steel sheet with a high percentage of silicon. Just these scales are very difficult for removing from the surface. It was found out that the pulsations have influence on the heat transfer and removing scales from the hot surfaces of steel. Tests for descaling on the cold sheets showed that the scale layer is thinner for the case of pulsating water jet with comparison to the scale thickness after descaling by the non pulsating water jet.

Keywords

pulsating, descaling, water jet

RIV year

2010

Released

18.05.2011

Publisher

Tanger spol. s r.o.

Location

Rožnov pod Radhoštěm

ISBN

978-80-87294-17-8

Book

METAL 2010, 19th International Conference on metallurgy and Materials

Pages from

43

Pages to

48

Pages count

6

BibTex


@inproceedings{BUT30417,
  author="Milan {Hnízdil} and Miroslav {Raudenský}",
  title="Descaling by Pulsating Water Jet",
  annote="Descaling is the process when scales are removed by water jet. In Academy of science in Ostrava, they have patented device called pulsator which can add to the water some extra energy in the form of high-frequency pressure pulses which disintegrate flat water jet. This paper deals with a new study of removing scales using pulsations and its comparison with descaling process without pulsating water jet. There are two main factors the thermal shock and the impact pressure applied by the impinging water onto the surface. During cold rolling is important only impact pressure. The descaling by pulsating water jet was also tested on the sheets generally used during cold rolling, because pulses create very short pressure peaks in the impact area higher than 300 MPa. While during the descaling without pulses is impact pressure approximately 1 - 5 MPa. Heat transfer and descaling tests were performed on carbon steel plate and steel sheet with a high percentage of silicon. Just these scales are very difficult for removing from the surface. It was found out that the pulsations have influence on the heat transfer and removing scales from the hot surfaces of steel. Tests for descaling on the cold sheets showed that the scale layer is thinner for the case of pulsating water jet with comparison to the scale thickness after descaling by the non pulsating water jet.",
  address="Tanger spol. s r.o.",
  booktitle="METAL 2010, 19th International Conference on metallurgy and Materials",
  chapter="30417",
  howpublished="print",
  institution="Tanger spol. s r.o.",
  year="2011",
  month="may",
  pages="43--48",
  publisher="Tanger spol. s r.o.",
  type="conference paper"
}