20.500.12556/DiRROS-23634 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 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. film boiling extreme thermal conditions phase-change modelling computational fluid dynamics two-phase flow ekstremne toplotne razmere true false true Elsevier Nizozemska Angleški jezik Slovenski jezik © 2025 The Author(s). Neznano 2025-09-16 14:05:48 2025-09-16 14:05:48 2025-10-24 03:54:42 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Soavtorji iz Slovenije: Matej Tekavčič, Mitja Uršič, Mihael Sekavčnik; Opis vira z dne 16. 9. 2025; str. 1-12 pt. 2, [article no.] 127813 Vol. 255 Feb. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-03-03 2025-09-07 2025-09-12 536 1879-2189 10.1016/j.ijheatmasstransfer.2025.127813 249107715 https://www.sciencedirect.com/science/article/pii/S0017931025011482 1 7caba1c9-92f5-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34973 RAZ_Koncar_Mihael_Bostjan_2026.pdf RAZ_Koncar_Mihael_Bostjan_2026.pdf 1 753B73099DA5AF489BA13235D6788DE1 641c03c80df11d6b68c17bae05d1e5528330e35eee7462949101a9c4c8b96c06 b83112fa-92f5-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34974 Institut Jožef Stefan 0 0 0