首页|Mesoscopic simulation of molten pool heat transfer and fluid flow with moving annular laser via lattice Boltzmann method
Mesoscopic simulation of molten pool heat transfer and fluid flow with moving annular laser via lattice Boltzmann method
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NSTL
Elsevier
Using the lattice Boltzmann method (LBM), a double distribution LB model for annular heat sources based on the variation of thermal conductivity and thermal diffusivity with temperature to study annular laser-material interaction is developed. The model is verified with the enthalpy-based method, and good agreement is obtained. The inner and outer annular radii can regulate convective heat transfer to affect the flow pattern and the depth of the molten pool. The temperature field, velocity vector field and average Nusselt number under different inner and outer annular radii are analyzed. The ratio of Marangoni number to Rayleigh number is proposed for the comparative analysis of natural convection and Marangoni convection intensities in the molten pool. The simulation results reveal that smaller inner and outer annular radii lead to smaller Nu_(avg), and the inhibition of convection inside of molten pool leads to a deeper molten pool. In the scope of present work, the outer annular radius to make the temperature field of the molten pool more uniform is in the range of 2.0-2.5 mm. The inner annular radius to make the molten pool deeper is in the range of 1.5-2.0 mm.
NSTL
Elsevier
