Nitrogen cooling has become a popular solution to reduce heat flux between the die and the profile in the hot extrusion process. However, designing effective cooling channels for complex-shape profiles poses challenges, especially when the phase transition of nitrogen significantly impacts heat transfer with solid bodies. To this end, the ability to model both the liquid and the gas phase is instrumental in devising design strategies, yet it should be combined with low computational complexity for industrial applications. The present work is aimed at employing the homogenous-flow approach as a simple, yet representative methodology to consider both phases in the simulations. One-dimensional model of nitrogen was combined with a three-dimensional extrusion model to perform the transient analysis of the whole process, mostly focused on the transition from fully gaseous to fully liquid flow. Validation using extrusion tests on seventeen AA6060 billets demonstrates the model's predictability in comparison with a fully liquid model. The average error associated with Homogeneous Flow Model was evaluated as below 10%, whereas the fully liquid approach yielded 25%. That proved the ability of the proposed model to reproduce the cooling effect, thus supporting the design of the cooling subsystem within the context of the whole extrusion tooling.

A simple approach to transient-state modeling of nitrogen cooling in the extrusion of light-alloy complex profiles / Pelaccia, Riccardo; Negozio, Marco; Santangelo, Paolo Emilio. - In: JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. - ISSN 1087-1357. - 147:2(2025), pp. 1-12. [10.1115/1.4066665]

A simple approach to transient-state modeling of nitrogen cooling in the extrusion of light-alloy complex profiles

Pelaccia, Riccardo;Santangelo, Paolo Emilio
2025

Abstract

Nitrogen cooling has become a popular solution to reduce heat flux between the die and the profile in the hot extrusion process. However, designing effective cooling channels for complex-shape profiles poses challenges, especially when the phase transition of nitrogen significantly impacts heat transfer with solid bodies. To this end, the ability to model both the liquid and the gas phase is instrumental in devising design strategies, yet it should be combined with low computational complexity for industrial applications. The present work is aimed at employing the homogenous-flow approach as a simple, yet representative methodology to consider both phases in the simulations. One-dimensional model of nitrogen was combined with a three-dimensional extrusion model to perform the transient analysis of the whole process, mostly focused on the transition from fully gaseous to fully liquid flow. Validation using extrusion tests on seventeen AA6060 billets demonstrates the model's predictability in comparison with a fully liquid model. The average error associated with Homogeneous Flow Model was evaluated as below 10%, whereas the fully liquid approach yielded 25%. That proved the ability of the proposed model to reproduce the cooling effect, thus supporting the design of the cooling subsystem within the context of the whole extrusion tooling.
2025
14-ott-2024
147
2
1
12
A simple approach to transient-state modeling of nitrogen cooling in the extrusion of light-alloy complex profiles / Pelaccia, Riccardo; Negozio, Marco; Santangelo, Paolo Emilio. - In: JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. - ISSN 1087-1357. - 147:2(2025), pp. 1-12. [10.1115/1.4066665]
Pelaccia, Riccardo; Negozio, Marco; Santangelo, Paolo Emilio
File in questo prodotto:
File Dimensione Formato  
Pelaccia_ASME JMSE_2025.pdf

Accesso riservato

Tipologia: Versione pubblicata dall'editore
Dimensione 1.33 MB
Formato Adobe PDF
1.33 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1358406
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact