About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Presentation Title |
Surface wetting and roughness-aware droplet solidification model for metal-droplet based additive manufacturing |
| Author(s) |
Viktor Sukhotskiy, Benedikt Kirchebner, Andrew Pascall |
| On-Site Speaker (Planned) |
Benedikt Kirchebner |
| Abstract Scope |
Droplet-based additive manufacturing methods, such as Molten Metal Jetting (MMJ), rely on effective bonding between the first deposited layer and the heated substrate. To date, CFD models have been used to understand interfacial heat transfer. Temperatures, velocities, density, and thermal conductivity of the melt remain the strongest variables that affect sequential solidification of molten droplets. Surface roughness and wetting angle are typically not considered, though empirically they have a pronounced effect. We simulate and experimentally test a model of roughness and contact angle that describes wetting and heat transfer effects of droplets impacting a rough surface, showing that the droplet bonding and solidification shape can be affected by the preparation of the surface (surface roughness) and a careful selection of the substrate material (contact angle). We use a coupled thermal-fluid simulation to test this on molten tin and propose recommendations on first-layer bonding.
Prepared by LLNL under Contract DE-AC52-07NA27344. LLNL-ABS-2019010 |
| Proceedings Inclusion? |
Undecided |