Influence of Water Temperature on The Cooling Intensity of Mist Nozzles in Continuous Casting

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F12%3APU99224" target="_blank" >RIV/00216305:26210/12:PU99224 - isvavai.cz</a>

Výsledek na webu

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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 of Mist Nozzles in Continuous Casting

Popis výsledku v původním jazyce

Small mist nozzles used in continuous casting were tested for heat transfer intensity. These nozzles are used in the secondary cooling area of a steel slab casting machine. Impact pressure distribution was measured first. Laboratory measurements of cooling intensity (heat transfer coefficient distribution) were performed with a variable water temperature. A temperature range from 20 degree C to 80 degree C was used in the tests. Surprisingly, the water temperature was found to have a strong influence. The most noticeable effect is a shift of the Leidenfrost temperature to low temperatures. Changing the water temperature from 20 degree C to 80 degree C caused a change of the Leidenfrost temperature of 130 degree C. This can be significant and can change the cooling character in the continuous casting machine. It is interesting that with an increase of the cooling intensity with a growing water temperature in a high temperature region (above Leidenfrost temperature), there is a small difference about 30 W/m2K. Surprisingly high differences in the Leidenfrost temperature were found for an intensive cooling where a difference of only 20 degree C in the coolant temperature makes a difference of about 100 degreeC in the Leidenfrost temperature. The results of the experiments performed with an elevated water temperature showed a high sensitivity of the cooling intensity to this parameter. The decreasing effect of the cooling intensity with the water temperature is more important for spray cooling of high intensities.

Název v anglickém jazyce

Influence of Water Temperature on The Cooling Intensity of Mist Nozzles in Continuous Casting

Popis výsledku anglicky

Small mist nozzles used in continuous casting were tested for heat transfer intensity. These nozzles are used in the secondary cooling area of a steel slab casting machine. Impact pressure distribution was measured first. Laboratory measurements of cooling intensity (heat transfer coefficient distribution) were performed with a variable water temperature. A temperature range from 20 degree C to 80 degree C was used in the tests. Surprisingly, the water temperature was found to have a strong influence. The most noticeable effect is a shift of the Leidenfrost temperature to low temperatures. Changing the water temperature from 20 degree C to 80 degree C caused a change of the Leidenfrost temperature of 130 degree C. This can be significant and can change the cooling character in the continuous casting machine. It is interesting that with an increase of the cooling intensity with a growing water temperature in a high temperature region (above Leidenfrost temperature), there is a small difference about 30 W/m2K. Surprisingly high differences in the Leidenfrost temperature were found for an intensive cooling where a difference of only 20 degree C in the coolant temperature makes a difference of about 100 degreeC in the Leidenfrost temperature. The results of the experiments performed with an elevated water temperature showed a high sensitivity of the cooling intensity to this parameter. The decreasing effect of the cooling intensity with the water temperature is more important for spray cooling of high intensities.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

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 periodika

Materiali in tehnologije

ISSN

1580-2949

e-ISSN

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Svazek periodika

46

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

SI - Slovinská republika

Počet stran výsledku

5

Strana od-do

311-315

Kód UT WoS článku

000305657100020

EID výsledku v databázi Scopus

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