Determination of transient heat transfer by cooling channel in high-pressure die casting using inverse method
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Date
2024-05-01
Authors
Boháček, Jan
Mráz, Kryštof
Hvožďa, Jiří
Lang, Filip
Raudenský, Miroslav
Vakhrushev, Alexander
Karimi-Sibaki, Ebrahim
Kharicha, Abdellah
0000-0003-3319-4254Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
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Abstract
Complex shapes of aluminum castings are typically manufactured during the short cycle process known as the high-pressure die casting (HPDC). High productivity is ensured by introducing die cooling through a system of channels, die inserts or jet coolers. Die cooling can also effectively help in reducing internal porosity in cast components. Accurate simulations based on sophisticated numerical models require accurate input data such as material properties, initial and boundary conditions. Although the heat is dominantly dissipated through die cooling, indicating the importance of knowing precise thermal boundary conditions, open literature lacks a detailed information about the spatial distribution of heat transfer coefficient. This study presents an inverse method to determine accurate heat transfer coefficients of a die insert based on temperature measurements in multiple points by 0.5 mm K-type thermocouples and a subsequent solution of the two-dimensional inverse heat conduction problem. The solver was built in the open-source CFD code OpenFOAM and the free library for nonlinear optimization NLopt. The results are presented for the commonly used 10 mm die insert with a hemispherical tip and coolant flow rates ranging from 100 l/h to 200 l/h. Heat transfer coefficients reach values well above 50 kW/m2K in the hemispherical tip, which is followed by a secondary peak and then a gradual drop to values around 1 kW/m2K further downstream.
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Citation
Journal of Physics: Conference Series. 2024, vol. 2766, issue 1, p. 1-6.
https://iopscience.iop.org/article/10.1088/1742-6596/2766/1/012197
https://iopscience.iop.org/article/10.1088/1742-6596/2766/1/012197
Document type
Peer-reviewed
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Published version
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Language of document
en