Design of a submerged entry nozzle for thin slab molds operating at high casting speeds

Rodolfo D. Morales, Yong Tang, Gerald Nitzl, Cristoph Eglsáeer, Gernot Hackl

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

A submerged entry nozzle (SEN) for thin slab casters operating at casting speeds as high as 7.5 m/minute was developed based on fundamental grounds of boundary-layer theory and water modeling experiments. Experimental techniques included tracer injection to observe overall fluid flow patterns, high speed video camera and image analysis to follow dynamic changes of meniscus levels and particle image velocimetry to measure water speeds in the mold. This design was compared with two other SEN designs of nozzles under current commercial use at various thin slab casters. Direct comparisons of mathematical simulations and experimental results among the three SEN's evidenced that this new SEN yields very stable flows which are independent from casting speed and nozzle immersion depth. Fluid flow developed by this SEN consists of a double roll pattern without generation of superficial vortices. The two other SEN's yield instable discharging jets due to and excessive shearing effects with the surrounding fluid inducing severe dissipation of kinetic energy which promotes severe tailing effects inducing strong meniscus oscillations. The proposed design has reported good industrial performances and a longer operating life because the slag protection belt suffers less wear thanks to smaller velocities of the bath in contact with the SEN wall. © 2012 ISIJ.
Original languageAmerican English
Pages (from-to)1607-1615
Number of pages9
JournalISIJ International
DOIs
StatePublished - 24 Sep 2012

Fingerprint

Molds
Nozzles
Casting
Flow of fluids
Nozzle design
Water
High speed cameras
Tailings
Video cameras
Shearing
Kinetic energy
Velocity measurement
Flow patterns
Image analysis
Slags
Boundary layers
Vortex flow
Wear of materials
Fluids
Experiments

Cite this

Morales, Rodolfo D. ; Tang, Yong ; Nitzl, Gerald ; Eglsáeer, Cristoph ; Hackl, Gernot. / Design of a submerged entry nozzle for thin slab molds operating at high casting speeds. In: ISIJ International. 2012 ; pp. 1607-1615.
@article{7977b1a990364e7f94fe6485873d67d0,
title = "Design of a submerged entry nozzle for thin slab molds operating at high casting speeds",
abstract = "A submerged entry nozzle (SEN) for thin slab casters operating at casting speeds as high as 7.5 m/minute was developed based on fundamental grounds of boundary-layer theory and water modeling experiments. Experimental techniques included tracer injection to observe overall fluid flow patterns, high speed video camera and image analysis to follow dynamic changes of meniscus levels and particle image velocimetry to measure water speeds in the mold. This design was compared with two other SEN designs of nozzles under current commercial use at various thin slab casters. Direct comparisons of mathematical simulations and experimental results among the three SEN's evidenced that this new SEN yields very stable flows which are independent from casting speed and nozzle immersion depth. Fluid flow developed by this SEN consists of a double roll pattern without generation of superficial vortices. The two other SEN's yield instable discharging jets due to and excessive shearing effects with the surrounding fluid inducing severe dissipation of kinetic energy which promotes severe tailing effects inducing strong meniscus oscillations. The proposed design has reported good industrial performances and a longer operating life because the slag protection belt suffers less wear thanks to smaller velocities of the bath in contact with the SEN wall. {\circledC} 2012 ISIJ.",
author = "Morales, {Rodolfo D.} and Yong Tang and Gerald Nitzl and Cristoph Egls{\'a}eer and Gernot Hackl",
year = "2012",
month = "9",
day = "24",
doi = "10.2355/isijinternational.52.1607",
language = "American English",
pages = "1607--1615",
journal = "ISIJ International",
issn = "0915-1559",
publisher = "Iron and Steel Institute of Japan",

}

Design of a submerged entry nozzle for thin slab molds operating at high casting speeds. / Morales, Rodolfo D.; Tang, Yong; Nitzl, Gerald; Eglsáeer, Cristoph; Hackl, Gernot.

In: ISIJ International, 24.09.2012, p. 1607-1615.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Design of a submerged entry nozzle for thin slab molds operating at high casting speeds

AU - Morales, Rodolfo D.

AU - Tang, Yong

AU - Nitzl, Gerald

AU - Eglsáeer, Cristoph

AU - Hackl, Gernot

PY - 2012/9/24

Y1 - 2012/9/24

N2 - A submerged entry nozzle (SEN) for thin slab casters operating at casting speeds as high as 7.5 m/minute was developed based on fundamental grounds of boundary-layer theory and water modeling experiments. Experimental techniques included tracer injection to observe overall fluid flow patterns, high speed video camera and image analysis to follow dynamic changes of meniscus levels and particle image velocimetry to measure water speeds in the mold. This design was compared with two other SEN designs of nozzles under current commercial use at various thin slab casters. Direct comparisons of mathematical simulations and experimental results among the three SEN's evidenced that this new SEN yields very stable flows which are independent from casting speed and nozzle immersion depth. Fluid flow developed by this SEN consists of a double roll pattern without generation of superficial vortices. The two other SEN's yield instable discharging jets due to and excessive shearing effects with the surrounding fluid inducing severe dissipation of kinetic energy which promotes severe tailing effects inducing strong meniscus oscillations. The proposed design has reported good industrial performances and a longer operating life because the slag protection belt suffers less wear thanks to smaller velocities of the bath in contact with the SEN wall. © 2012 ISIJ.

AB - A submerged entry nozzle (SEN) for thin slab casters operating at casting speeds as high as 7.5 m/minute was developed based on fundamental grounds of boundary-layer theory and water modeling experiments. Experimental techniques included tracer injection to observe overall fluid flow patterns, high speed video camera and image analysis to follow dynamic changes of meniscus levels and particle image velocimetry to measure water speeds in the mold. This design was compared with two other SEN designs of nozzles under current commercial use at various thin slab casters. Direct comparisons of mathematical simulations and experimental results among the three SEN's evidenced that this new SEN yields very stable flows which are independent from casting speed and nozzle immersion depth. Fluid flow developed by this SEN consists of a double roll pattern without generation of superficial vortices. The two other SEN's yield instable discharging jets due to and excessive shearing effects with the surrounding fluid inducing severe dissipation of kinetic energy which promotes severe tailing effects inducing strong meniscus oscillations. The proposed design has reported good industrial performances and a longer operating life because the slag protection belt suffers less wear thanks to smaller velocities of the bath in contact with the SEN wall. © 2012 ISIJ.

U2 - 10.2355/isijinternational.52.1607

DO - 10.2355/isijinternational.52.1607

M3 - Article

SP - 1607

EP - 1615

JO - ISIJ International

JF - ISIJ International

SN - 0915-1559

ER -