Influence of particle size on powder velocity distribution at the nozzle outlet in Directed Energy Deposition

Mede, Tijan (avtor), Jeromen, Andrej (avtor), Govekar, Edvard (avtor), Mallon, Michael (avtor), Godec, Matjaž (avtor)

Metal-based Directed Energy Deposition (DED) is considered one of the variations of additive manufacturing with the highest potential, particularly for space industry and in-orbital manufacturing. The technology however still faces various challenges, many of which can be traced back to poor control and understanding of the powder delivery. Velocity distribution of powder particles at the DED nozzle outlet has a key influence on the results of any predictive model of powder stream and yet remains largely disputed. Certain numerical studies highlighted a possible influence of powder particle size on the velocity condition at the nozzle exit, yet no experimental studies confirmed this effect. The experimental campaign described in this paper quantifies this relation between powder particle size and velocity distribution at the nozzle outlet and a strong decrease of particle speed with particle size is observed. Moreover, smaller particles are observed to travel at speeds higher than the mean carrier gas speed suggesting powder particle segregation within the nozzle as one of the mechanisms driving speed differences at the nozzle outlet.

• Jezik: Angleški jezik
• Ključne besede: directed energy deposition, powder stream, boundary conditions, particle velocity distribution
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 10 str.
• Številčenje: Vol. 259, art. 114680
• PID: 20.500.12556/RUL-173515
• UDK: 621.791.72
• ISSN pri članku: 0264-1275
• DOI: 10.1016/j.matdes.2025.114680
• COBISS.SI-ID: 230759683
• Datum objave v RUL: 18.09.2025

Gradivo je del revije

• Naslov: Materials & design
• Skrajšan naslov: Mater. des.
• Založnik: Scientific and Technical Press
• ISSN: 0264-1275
• COBISS.SI-ID: 10626075

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: lasersko direktno navarjanje, tok delcev, robni pogoji, porazdelitev hitrosti delcev