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Surface tension of falling droplets at high temperature
University West, Department of Engineering Science, Division of mechanical engineering. Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå (SWE). (KAMPT)
2024 (English)In: Procedia CIRP: 13th CIRP Conference on Photonic Technologies [LANE 2024], 15-19 September 2024, Fürth, Germany / [ed] Michael Schmidt, 2024, Vol. 124, p. 590-593Conference paper, Published paper (Refereed)
Abstract [en]

Surface tension is an essential parameter that defines many aspects of materials processing. In particular, at high temperatures,surface tension data of metals is missing. Due to the challenges during high temperature measurements, mainly extrapolated ortheoretical data are available. Therefore, an adaption of the falling oscillating droplet method is suggested to derive surface tensionvalues of liquid steel surfaces. A spherical droplet was pre-positioned on plastic foil to be melted by a laser beam. During falling,high-speed imaging could record the oscillations and related frequency spectra were derived. Based on extracted characteristicfrequencies, surface tension values were obtained comparing different theoretical models and adaptions to impacts of gravity,asphericity and viscosity of the material. The method was shown to give reasonable values of surface tension when accounting forgravity impacts.

Place, publisher, year, edition, pages
2024. Vol. 124, p. 590-593
Keywords [en]
Laser; heating; oscillating drop; surface tension; melting
National Category
Materials Engineering
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-22752DOI: 10.1016/j.procir.2024.08.180Scopus ID: 2-s2.0-85204338437OAI: oai:DiVA.org:hv-22752DiVA, id: diva2:1920885
Conference
13th CIRP Conference on Photonic Technologies [LANE 2024], 15-19 September 2024, Fürth, Germany
Funder
Swedish Research Council, 2020-04250
Note

CC-BY 4.0

The author kindly acknowledges the funding of SMART—Surface tension of Metals Above vapoRization Temperature(Vetenskapsrådet—The Swedish Research Council, 2020-04250).

Available from: 2024-12-12 Created: 2024-12-12 Last updated: 2025-09-30

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Volpp, Jörg

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