Documents

  • HTFF_201

    Final published version, 725 KB, PDF document

DOI

Heat and fluid flow in low Prandtl number melting pools during laser processing of materials are sensitive to the prescribed boundary conditions, and the responses are highly nonlinear. Previous studies have shown that fluid flow in melt pools with surfactants can be unstable at high Marangoni numbers. In numerical simulations of molten metal flow in melt pools, surface deformations and its influence on the energy absorbed by the material are often neglected. However, this simplifying assumption may reduce the level of accuracy of numerical predictions with surface deformations. In the present study, we carry out three-dimensional numerical simulations to realise the effects of surface deformations on thermocapillary flow instabilities in laser melting of a metallic alloy with surfactants. Our computational model is based on the finite-volume method and utilises the volume-of-fluid (VOF) method for gas-metal interface tracking. Additionally, we employ a dynamically adjusted heat source model and discuss its influence on numerical predictions of the melt pool behaviour. Our results demonstrate that including free surface deformations in numerical simulations enhances the predicted flow instabilities and, thus, the predicted solid-liquid interface morphologies.
Original languageEnglish
Title of host publicationProceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering (MCM'19)
Subtitle of host publication6th International Conference on Heat Transfer and Fluid Flow
Number of pages8
DOIs
Publication statusPublished - 2019
EventMCM '19: 5th World Congress on Mechanical, Chemical, and Material Engineering - Lisbon, Portugal
Duration: 15 Aug 201917 Aug 2019

Conference

ConferenceMCM '19: 5th World Congress on Mechanical, Chemical, and Material Engineering
CountryPortugal
CityLisbon
Period15/08/1917/08/19

    Research areas

  • Free surface oscillations, Thermocapillary flow instabilities, Molten metal melt pool, Heat source adjustment, Laser melting, Welding, Additive manufacturing

ID: 56198951