Stable implementation of a Chen-based enhancement to the Lee phase-change model for CFD simulation of film boiling under energetic melt-coolant interaction conditions

Končar, Mihael Boštjan (author), Tekavčič, Matej (author), Uršič, Mitja (author), Sekavčnik, Mihael (author)

This study investigates heat and mass transfer during energetic melt-coolant interactions, focusing on film boiling around a hot melt particle in subcooled convective flow. The considered conditions, free-flow velocities of a few m/s, melt particle temperatures of several thousand K, particle diameters of several tens of a μm, and liquid subcooling of several tens of a K, align with TREPAM experiments (CEA, France). A two-phase computational fluid dynamics framework, based on the Volume of Fluid method, is used. An improved phase-change model is implemented, combining Chen’s explicit formulation of the phase-change intensity factor with the robustness of the conventional Lee model. The approach reduces sensitivity to empirical parameters and enhances phase-change localisation. Additional constraints on the intensity factor ensure numerical stability under extreme thermal conditions relevant to vapour energetic melt-coolant interactions. Simulations of TREPAM experiments demonstrate improved heat flux predictions and enhanced flow dynamics capture. Analysis of the simulated velocity fields reveal secondary flows in the vapour wake, impacting heat and mass transfer and emphasizing the need to resolve vapor-phase flow conditions. To fully validate proposed modifications to phase-change model further numerical and experimental investigation is required, focusing on vapour film morphology and localized heat transfer intensity.

• Language: English
• Keywords: heat transfer, film boiling, extreme thermal conditions, phase-change modelling, computational fluid dynamics (CFD), two-phase flow
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 12 str.
• Numbering: Vol. 255, part 2, [article no.] 127813
• PID: 20.500.12556/RUL-173575
• UDC: 536.2
• ISSN on article: 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2025.127813
• COBISS.SI-ID: 249452547
• Publication date in RUL: 18.09.2025

Record is a part of a journal

• Title: International journal of heat and mass transfer
• Shortened title: Int. J. Heat Mass Transfer
• Publisher: Elsevier
• ISSN: 1879-2189
• COBISS.SI-ID: 23007493

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: prenos toplote, plastno uparjanje, ekstremni termodinamski pogoji, modeliranje faznega prehoda, računalniška dinamika tekočin (RDT), dvofazni tok