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Inductive measurement of thermophysical properties of electromagnetically levitated metallic melts

Lohöfer, Georg and Pottlacher, Gernot (2011) Inductive measurement of thermophysical properties of electromagnetically levitated metallic melts. High Temperatures - High Pressures, 40, pp. 237-248. Old City Publishing, Inc..

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Abstract

For the containerless processing of high temperature metallic melts the electromagnetic levitation technique, which utilizes high frequency alternating magnetic fields for the contactless, inductive positioning and heating of electrically conducting samples, is well established. For the contactless measurement of surface tension and viscosity of levitated samples via the oscillating drop method optical methods are generally used. But the existence of alternating magnetic fields in electromagnetic levitation facilities suggests to use also inductive methods for non-contact measurements of liquid metal properties. Within a joint ESA project of DLR and TU Graz a measurement device was designed and constructed by DLR, which utilizes the high frequency magnetic fields of microgravity electromagnetic levitation facilities imultaneously also for an inductive determination of thermophysical properties of levitated metallic melts. Although originally planned for electrical resistivity measurements only, the device allows also the detection of surface oscillations, which can be used for a determination of surface tension and viscosity of the levitated droplets. The present paper compares the optical with the inductive measurement technique.

Document Type:Article
Title:Inductive measurement of thermophysical properties of electromagnetically levitated metallic melts
Authors:
AuthorsInstitution or Email of Authors
Lohöfer, GeorgGeorg.Lohoefer@dlr.de
Pottlacher, GernotTU Graz
Date:2011
Journal or Publication Title:High Temperatures - High Pressures
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Volume:40
Page Range:pp. 237-248
Publisher:Old City Publishing, Inc.
Status:Published
Keywords:electromagnetic levitation, micro gravity, inductive measurement technique, electrical resistivity, surface oscillation, viscosity, surface tension
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Georg Lohöfer
Deposited On:12 Dec 2011 13:12
Last Modified:12 Dec 2011 13:12

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