20.500.12556/RUL-182704 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. heat transfer film boiling extreme thermal conditions phase-change modelling computational fluid dynamics CFD two-phase flow prenos toplote plastno uparjanje ekstremni termodinamski pogoji modeliranje faznega prehoda računalniška dinamika tekočin RDT dvofazni tok hlajenje true false true Angleški jezik Slovenski jezik Članek v reviji 2026-05-21 09:29:14 2026-05-21 09:29:14 2026-07-08 12:25:23 0000-00-00 00:00:00 2026 0 0 12 str. pt. 2, art. 127813 Vol. 255 Feb. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.2 1879-2189 10.1016/j.ijheatmasstransfer.2025.127813 249107715 RAZ_Koncar_Mihael_Bostjan_2026.pdf RAZ_Koncar_Mihael_Bostjan_2026.pdf 1 EE02D7895F5DF1D90B0666071BE61D16 32a4dd5ed5dd1a8f45b86f52dad9e6e1164c8c91d085f6e26e68c218d575e997 ca1fe22f-54e6-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234186 https://www.sciencedirect.com/science/article/pii/S0017931025011482 1 72e43b6b-54e6-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234185 Fakulteta za strojništvo Fakulteta za matematiko in fiziko 0 0 0