Single Fluid Atomization Fundamentals

Bogno, Abdoul-Aziz; Henein, H.; Uhlenwinkel, Volker; Gärtner, Eric

doi:10.1007/978-3-319-52689-8_2

Cited by 1 publication

(2 citation statements)

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“…The size of the solidification microstructure is related to the solidification cooling over the entire local solidification process [11]. Therefore, the cooling rate is computed as the difference between liquidus and solidus temperature with respect to the local solidification time:…”

Section: Cooling Rate Calculationmentioning

confidence: 99%

“…The centrifugal atomization technique offers many advantages, compared to more conventional gas and water atomization technologies, in terms of spherical shape, narrow particle size distribution, low satellite content, and high energy efficiency [11]. Although these characteristics are of greatest interest in many of the classic applications of metal powder, the need for new materials with a unique combination of properties is increasingly emerging to satisfy the powder metallurgy industry needs, which makes way to amplify the research spectrum in the use of this technology.…”

Section: Introductionmentioning

confidence: 99%

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Cooling Rate Modeling and Evaluation during Centrifugal Atomization Process

Cegarra

Pijuan

Riera

2023

JMMP

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Centrifugal atomization is a rapid solidification technique involving fast cooling rates to produce high-quality powders. The final microstructure of the atomized particles is closely linked with the thermal history and cooling rates experienced during the atomization process. However, there is insufficient research on the temperature evolution of metal particles produced by this technique, and most works evaluate the thermal history of the droplet through semi-empirical correlations that lie outside the conditions where they were derived. In this work, the cooling rate of centrifugally atomized Al-4% Cu was studied via mathematical modelling and experimental validation. A heat transfer model was implemented, and the value of the convective heat transfer coefficient was obtained from the Whitaker semi-empirical correlation considering three cases of study for the thermophysical properties of the gas. The validity of the Whitaker correlation was experimentally evaluated by means of cooling rates based on the Secondary Dendrite Arm Spacing (SDAS) technique. The Whitaker correlation with the Reynolds and Prandtl numbers evaluated at the ambient temperature and the gas conductivity evaluated at the film temperature gave the best agreement with the experimental results, with cooling rates in the order of 105 K s−1 for <32.5 µm powders atomized in He atmosphere.

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Section: Cooling Rate Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%