Non-stationary Boundary Conditions in the Thermal Model of Continuous Casting

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F16%3A86099325" target="_blank" >RIV/61989100:27360/16:86099325 - 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

Non-stationary Boundary Conditions in the Thermal Model of Continuous Casting

Popis výsledku v původním jazyce

The article focuses on the issue of boundary conditions for simulations of non-steady states in continuous casting machines. Numerical models of the temperature field of the continuously cast strand based on the finite difference method were implemented in off-line and on-line versions. The correctness of the simulation depends on the accuracy of the boundary conditions. Their determination is a technically demanding and costly procedure. From operational data, only approximate boundary conditions can typically be obtained; often average values in time or in space rather than the detailed local and immediate values. Modelling of unsteady behaviour of the casting process is therefore characterized by uncertainty. The boundary condition in the mould can be determined by means of measuring temperatures directly in the mould wall using thermocouples. However, it is demanding to keep the sensors installed permanently in greater numbers. The boundary condition in the secondary cooling area is based on the measurement of heat transfer coefficient by means of the laboratory physical model. Significant complication is caused by non-linearity of heat transfer coefficient in the secondary cooling area due to the Leidenfrost phenomenon. Two reasons of the boundary conditions time variations can be distinguished. The first are deterministic, induced by the operator's changes of casting and cooling parameters, the second are random or quasiperiodic changes, caused by spontaneous fluctuations of parameters and internal quantities

Název v anglickém jazyce

Non-stationary Boundary Conditions in the Thermal Model of Continuous Casting

Popis výsledku anglicky

The article focuses on the issue of boundary conditions for simulations of non-steady states in continuous casting machines. Numerical models of the temperature field of the continuously cast strand based on the finite difference method were implemented in off-line and on-line versions. The correctness of the simulation depends on the accuracy of the boundary conditions. Their determination is a technically demanding and costly procedure. From operational data, only approximate boundary conditions can typically be obtained; often average values in time or in space rather than the detailed local and immediate values. Modelling of unsteady behaviour of the casting process is therefore characterized by uncertainty. The boundary condition in the mould can be determined by means of measuring temperatures directly in the mould wall using thermocouples. However, it is demanding to keep the sensors installed permanently in greater numbers. The boundary condition in the secondary cooling area is based on the measurement of heat transfer coefficient by means of the laboratory physical model. Significant complication is caused by non-linearity of heat transfer coefficient in the secondary cooling area due to the Leidenfrost phenomenon. Two reasons of the boundary conditions time variations can be distinguished. The first are deterministic, induced by the operator's changes of casting and cooling parameters, the second are random or quasiperiodic changes, caused by spontaneous fluctuations of parameters and internal quantities

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2016: conference proceedings : (reviewed version) : 25th Anniversary International Conference on Metallurgy and Materials : May 25th-27th 2016, Hotel Voronez I, Brno, Czech Republic, EU

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

54-59

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

25. 5. 2016

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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