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The effects of the excitation pulse on flow in electromagnetic levitation experiments

Bracker, G. P. and Hyers, R.W. (2023) The effects of the excitation pulse on flow in electromagnetic levitation experiments. High Temperatures-High Pressures, 52 (2), pp. 111-122. Old City Publishing. doi: 10.32908/hthp.v52.1301. ISSN 0018-1544. (In Press)

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Oscillating drop experiments allow the surface tension and viscosity of high temperature and highly reactive melts to be measured without an interface contacting the surface of the molten sample. Surface oscillations are induced by varying the electromagnetic field. The oscillations are measured to determine the surface tension and viscosity from the frequency and damping of the oscillations, respectively. The damping of the oscillations is, however, sensitive to the flow conditions within the melt. Recent advances have allowed transient magnetohydrodynamic models to calculate changes in the internal flow in response to variations in the magnetic field, much like those used to induce surface oscillations. These models show that the excitation pulse drives rapid acceleration within the melt. While the fluid flow may accelerate to speeds above the laminar-turbulent transition, the flow speeds are not sustained for sufficient time periods to allow turbulent flow to develop. Following the excitation pulse, the flow rapidly slows and quickly returns to the conditions present before the excitation pulse.

Item URL in elib:https://elib.dlr.de/197369/
Document Type:Article
Title:The effects of the excitation pulse on flow in electromagnetic levitation experiments
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bracker, G. P.UNSPECIFIEDhttps://orcid.org/0000-0001-6288-4874UNSPECIFIED
Date:16 March 2023
Journal or Publication Title:High Temperatures-High Pressures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 111-122
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Old City Publishing
Series Name:13th International Workshop on Subsecond Thermophysics (IWSSTP-13)
Status:In Press
Keywords:Excitation Pulse, EML, Transient Flow Effects, CFD Simulations, Surface Oscillations, Metallic Melts, ISS-EML
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 - Research under Space Conditions
DLR - Research theme (Project):R - Project EML, R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Bracker, Gwendolyn
Deposited On:25 Sep 2023 07:08
Last Modified:18 Oct 2023 13:28

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