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Atomization and Sprays
Facteur d'impact: 1.189 Facteur d'impact sur 5 ans: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v6.i3.40
pages 305-329

PRECISION DROPLET-BASED MANUFACTURING AND MATERIAL SYNTHESIS: FLUID DYNAMICS AND THERMAL CONTROL ISSUES

Melissa E. Orme
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, USA
Changzheng Huang
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, USA
Jon Courier
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, USA

RÉSUMÉ

The development of a droplet based net-form manufacturing technique for structural materials which relies on the use of precisely controlled nanoliter droplets as the deposition element is discussed, and encouraging experimental and computational results are presented. Droplets are generated in a stagnant inert gas and are electrostatically charged and deflected onto a substrate, where they impact and solidify. During their flight they experience aerodynamic drag, which significantly alters the lateral deflection of small charged droplets. The droplets also experience convection at their boundary due to aerodynamic drag, which is time-dependent. After arrival at the substrate, the possibility of localized substrate remelting is explored by supplying thermal energy in the form of overheated molten droplets. Localized substrate remelting is important for the fabrication of homogeneous high-quality material components. Droplet stream angular dispersions of the order of 1 μ-radian and intradroplet speed dispersions of the order of 3 × 10−7 times the average droplet speed provide the basis for rapid solidification net-form manufacturing.


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