Importance of Thermophysical Properties on Calculation Accuracy of Thermokinetics of Solidification

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F11%3APU97187" target="_blank" >RIV/00216305:26210/11:PU97187 - 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

Importance of Thermophysical Properties on Calculation Accuracy of Thermokinetics of Solidification

Popis výsledku v původním jazyce

The thermophysical properties of steels have significant influence on the actual continuous and also gravitational casting process, and on the accuracy of its numerical simulation and optimization. The determination of these properties (heat conductivity, specific heat capacity and density in the solid and liquid states) often requires more time than the actual numerical calculation of the temperature fields of a casting. The influence of individual properties should be neither under- nor over-estimated. Therefore, an analysis/parametric study of these thermophysical properties was conducted. The order of importance within the actual process and the accuracy of simulation and optimization were also determined. Individual properties, which, in some cases, were obtained from tables, and in others experimentally, were substituted by an approximation using orthogonal polynomials. The accuracy of each polynomial is dependent on the precision of individual values. The order of significance of individual thermophysical properties was determined with respect to the metallurgical length for concasting process and with respect to the total solidification time for gravitational casting process. The analysis was performed by means of a so-called calculation experiment, i.e., by means of the original and universal numerical casting model developed by the authors of this paper. It is convenient to conduct such an analysis in order to facilitate the simulation of each individual case of casting, thus enhancing the process of optimization.

Název v anglickém jazyce

Importance of Thermophysical Properties on Calculation Accuracy of Thermokinetics of Solidification

Popis výsledku anglicky

The thermophysical properties of steels have significant influence on the actual continuous and also gravitational casting process, and on the accuracy of its numerical simulation and optimization. The determination of these properties (heat conductivity, specific heat capacity and density in the solid and liquid states) often requires more time than the actual numerical calculation of the temperature fields of a casting. The influence of individual properties should be neither under- nor over-estimated. Therefore, an analysis/parametric study of these thermophysical properties was conducted. The order of importance within the actual process and the accuracy of simulation and optimization were also determined. Individual properties, which, in some cases, were obtained from tables, and in others experimentally, were substituted by an approximation using orthogonal polynomials. The accuracy of each polynomial is dependent on the precision of individual values. The order of significance of individual thermophysical properties was determined with respect to the metallurgical length for concasting process and with respect to the total solidification time for gravitational casting process. The analysis was performed by means of a so-called calculation experiment, i.e., by means of the original and universal numerical casting model developed by the authors of this paper. It is convenient to conduct such an analysis in order to facilitate the simulation of each individual case of casting, thus enhancing the process of optimization.

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

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

2011

Kód důvěrnosti údajů

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

Název periodika

Journal of Materials Science and Engineering A

ISSN

1934-8959

e-ISSN

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Svazek periodika

A1, 2011

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

1037-1044

Kód UT WoS článku

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EID výsledku v databázi Scopus

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