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Powder particle–wall collision-based design of the discrete axial nozzle-exit shape in direct laser deposition
ID
Jeromen, Andrej
(
Author
),
ID
Vidergar, Ana
(
Author
),
ID
Fujishima, Makoto
(
Author
),
ID
Levy, Gideon N.
(
Author
),
ID
Govekar, Edvard
(
Author
)
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MD5: 16FDBC1D4C2101A9B1586BF916C64B79
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https://www.sciencedirect.com/science/article/pii/S0924013622002163
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Abstract
To improve the efficiency of the direct laser deposition (DLD) of metal powders, a concentrated powder-stream distribution is required, which can be affected by the shape of the powder-delivery nozzle. In this study, a simplified, powder particle–wall collision-based 3D numerical model of the powder flow in the nozzle was used to simulate the influences of the nozzle-exit shape on the concentration of the powder stream distribution, characterized by its diameter. The nozzle-exit shape was parametrized by the exit-cone angle, length, and inner-surface roughness. Based on the simulation results, the nozzle-exit shapes of three exit-cone angles (0°, 3.5° and 7.2°), various lengths and surface-roughness values were designed. For the two larger particle sizes of 22 μm and 82 μm considered, the wall-collision-dominated regime and the influence of the nozzle-exit shape were experimentally confirmed. In particular, a significant decrease in the powder-stream diameter when increasing the divergent nozzle-exit cone angle or decreasing its surface roughness and the nonlinear influence of the cone length were shown. Using single-layer, powder-deposition experiments it was demonstrated that by modifying the design of the nozzle-exit shape, the powder-catchment efficiency was increased by 13% due to the increased nozzle-exit cone angle and by 19% due to the reduced surface roughness.
Language:
English
Keywords:
direct laser deposition
,
axial nozzle shapes
,
wall-collision-dominated flow
,
powder-stream distribution
,
powder-catchment efficiency
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2022
Number of pages:
13 str.
Numbering:
Vol. 308, art. 117704
PID:
20.500.12556/RUL-138253
UDC:
621.7
ISSN on article:
0924-0136
DOI:
10.1016/j.jmatprotec.2022.117704
COBISS.SI-ID:
114823683
Publication date in RUL:
13.07.2022
Views:
988
Downloads:
144
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Record is a part of a journal
Title:
Journal of materials processing technology
Shortened title:
J. mater. process. technol.
Publisher:
Elsevier
ISSN:
0924-0136
COBISS.SI-ID:
30105600
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
neposredno lasersko nanašanje
,
aksialna oblika šob
,
trčenje sten v prevladujočem toku
,
porazdelitev toka prahu
,
učinkovitost zajemanja prahu
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0241
Name:
Sinergetika kompleksnih sistemov in procesov
Funder:
Other - Other funder or multiple funders
Funding programme:
DMG Mori Co., Ltd.
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