Influence of Water Temperature on the Cooling Intensity during Continuous Casting and Hot Rolling

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Water Temperature on the Cooling Intensity during Continuous Casting and Hot Rolling

Popis výsledku v původním jazyce

Two types of nozzles were tested to find out the influence of the water temperature on cooling intensity. The first type was a mist nozzle used in the secondary cooling area of a steel slab casting machine. The second type was a flat fan nozzle usually used during hot rolling and heat treatment process of rolled strips. These laboratory measurements of cooling intensity were performed in a temperature range of water temperature from 20 C to 80 C. A strong influence of the water temperature on cooling intensity was found. Changing the water temperature from 20 C to 80 C caused a change of heat transfer coefficient. For mist nozzle was found slightly increasing cooling intensity with growing water temperature. The difference was about 30 W m-2 K-1. For flat fan nozzle was found the decreasing cooling intensity with growing water temperature. The difference was about 110 W m-2 K-1. The main effect was not the change of heat transfer coefficient but the shift of Leidenfrost temperature to a lower temperature area. The change of water temperature from 20 C to 80 C caused the change of Leidenfrost temperature about 130 C for both nozzles. This can be a significant change of cooling and can affect the cooling character in industrial applications.

Název v anglickém jazyce

Influence of Water Temperature on the Cooling Intensity during Continuous Casting and Hot Rolling

Popis výsledku anglicky

Two types of nozzles were tested to find out the influence of the water temperature on cooling intensity. The first type was a mist nozzle used in the secondary cooling area of a steel slab casting machine. The second type was a flat fan nozzle usually used during hot rolling and heat treatment process of rolled strips. These laboratory measurements of cooling intensity were performed in a temperature range of water temperature from 20 C to 80 C. A strong influence of the water temperature on cooling intensity was found. Changing the water temperature from 20 C to 80 C caused a change of heat transfer coefficient. For mist nozzle was found slightly increasing cooling intensity with growing water temperature. The difference was about 30 W m-2 K-1. For flat fan nozzle was found the decreasing cooling intensity with growing water temperature. The difference was about 110 W m-2 K-1. The main effect was not the change of heat transfer coefficient but the shift of Leidenfrost temperature to a lower temperature area. The change of water temperature from 20 C to 80 C caused the change of Leidenfrost temperature about 130 C for both nozzles. This can be a significant change of cooling and can affect the cooling character in industrial applications.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

21ST INTERNATIONAL CONFERENCE ON METALLURGY AND MATERIALS (METAL 2012)

ISBN

978-80-87294-31-4

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

1-6

Název nakladatele

TANGER LTD

Místo vydání

OSTRAVA

Místo konání akce

Brno

Datum konání akce

23. 5. 2012

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000318506500016