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Modelling of electromagnetic levitation – consequences on non-contact physical properties measurements

Modelling of electromagnetic levitation – consequences on non-contact physical properties measurements

Etay, Jacqueline, Schetelat, Pascal, Bardet, Benoit, Priede, Janis, Bojarevics, Valdis and Pericleous, Koulis A. ORCID: 0000-0002-7426-9999 (2008) Modelling of electromagnetic levitation – consequences on non-contact physical properties measurements. High Temperature Materials and Processes, 27 (6). pp. 439-447. ISSN 2191-0324 (doi:10.1515/HTMP.2008.27.6.439)

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Abstract

Electromagnetic levitation of electrically conductive droplets by alternating magnetic fields is a technique used to determine the physical properties of liquid metallic alloys such as surface tension, viscosity, heat capacity and thermal diffusivity/1/. To improve accuracy, it is mandatory to reduce electromagnetic stirring and shaping of the droplet, therefore experiments are conducted in microgravity. Properties are deduced from direct measurements of position or temperature using specific models. Our purpose is to check various assumptions on which those models are built by the use of adapted numerical codes. We first compare experimental and numerical results concerning the shape and mass centre oscillation frequencies of electromagnetically levitated Nickel droplets. Axisymmetric numerical model yields equilibrium shapes and positions of the droplets in a good agreement with experiment. Then, fluid flow effects on the measurement precision of surface tension and viscosity by comparing expecte and calculated properties values are charcterized. We determine critical values of initial droplet distortion or magnetic field intensity which can lead to an overestimate of the value of viscosity. We also calculate flow effects of heat capacity and thermal conductivity values.

Item Type: Article
Additional Information: [1] First published in print: December 2008. [2] Published online: 6 May 2011. [2] High Temperature Materials and Processes was previously published by Freund Publishing House Ltd. [3] Published as: High Temperature Materials and Processes, (2008), Vol. 27, (6), pp. 439–448.
Uncontrolled Keywords: induction, electromagnetic levitation, fluid flow, viscosity measurement, surface tension measurement, heat capacity meassurement
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Q Science > QA Mathematics > QA76 Computer software
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:
Last Modified: 14 Oct 2016 09:09
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/3643

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