TY - CONF

T1 - Effect of Marangoni flow during the solidification of a Fe- 0.82wt.%C steel alloy

AU - Sari, Ibrahim

AU - Wu, Menghuai

AU - Ludwig, Andreas

AU - Kharicha, Abdellah

PY - 2024

Y1 - 2024

N2 - A two-phase Mixture model is proposed to simulate the liquid-solid phase transitionof a Fe-0.82wt%C steel alloy under the effect of Marangoni flow. This model simplifiescomputations by solving a single momentum and enthalpy equation for the mixture phase usinga three-dimensional finite volume method. The simulation involves solidifying a rectangularingot (100 × 10 × 100 mm3) from the cold bottom surface towards the hot-free surface at the top.To facilitate heat exchange with the surrounding environment, a high heat transfer coefficient ofh = 600 W/m2/K was applied on the bottom surface to establish an upward solidificationdirection. However, a lower heat transfer coefficient of 20 W/m2/K was applied on the top freesurface, which was considered flat. This study aims to examine the effect of Marangoni flowgenerated by surface tension on flow and segregation patterns. The results show that theMarangoni flow emerges at the free surface and penetrates into the liquid depth, leading to theformation of hexagonal patterns along the liquid thickness. Upon full solidification, macro-segregation also exhibits hexagonal structures, mirroring the stationary hexagonal shapesgenerated by Marangoni flow.

AB - A two-phase Mixture model is proposed to simulate the liquid-solid phase transitionof a Fe-0.82wt%C steel alloy under the effect of Marangoni flow. This model simplifiescomputations by solving a single momentum and enthalpy equation for the mixture phase usinga three-dimensional finite volume method. The simulation involves solidifying a rectangularingot (100 × 10 × 100 mm3) from the cold bottom surface towards the hot-free surface at the top.To facilitate heat exchange with the surrounding environment, a high heat transfer coefficient ofh = 600 W/m2/K was applied on the bottom surface to establish an upward solidificationdirection. However, a lower heat transfer coefficient of 20 W/m2/K was applied on the top freesurface, which was considered flat. This study aims to examine the effect of Marangoni flowgenerated by surface tension on flow and segregation patterns. The results show that theMarangoni flow emerges at the free surface and penetrates into the liquid depth, leading to theformation of hexagonal patterns along the liquid thickness. Upon full solidification, macro-segregation also exhibits hexagonal structures, mirroring the stationary hexagonal shapesgenerated by Marangoni flow.

KW - Marangoni Flow

KW - Fe-0.82wt%C

KW - steel alloy

KW - two-phase Mixture model

KW - CFD

U2 - 10.1088/1742-6596/2766/1/012198

DO - 10.1088/1742-6596/2766/1/012198

M3 - Paper

T2 - 9th edition of the European Thermal Sciences Conference

Y2 - 10 June 2024 through 13 June 2024

ER -