Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility

Abstract Oscillating droplet experiments are conducted using the Electromagnetic Levitation (EML) facility under microgravity conditions. The droplet of molten metal is internally stirred concurrently with the pulse excitation initiating shape oscillations, allowing viscosity measurement of the liqu...

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Autores principales:	Xiao Xiao, Jürgen Brillo, Jonghyun Lee, Robert W. Hyers, Douglas M. Matson
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Biotechnology TP248.13-248.65 Physiology QP1-981
Acceso en línea:	https://doaj.org/article/6c03e2714d924f1e98b9a71cf7210a80
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spelling	oai:doaj.org-article:6c03e2714d924f1e98b9a71cf7210a802021-12-02T18:37:14ZImpact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility10.1038/s41526-021-00166-42373-8065https://doaj.org/article/6c03e2714d924f1e98b9a71cf7210a802021-10-01T00:00:00Zhttps://doi.org/10.1038/s41526-021-00166-4https://doaj.org/toc/2373-8065Abstract Oscillating droplet experiments are conducted using the Electromagnetic Levitation (EML) facility under microgravity conditions. The droplet of molten metal is internally stirred concurrently with the pulse excitation initiating shape oscillations, allowing viscosity measurement of the liquid melts based on the damping rate of the oscillating droplet. We experimentally investigate the impact of convection on the droplet’s damping behavior. The effective viscosity arises and increases as the internal convective flow becomes transitional or turbulent, up to 2–8 times higher than the intrinsic molecular viscosity. The enhanced effective viscosity decays when the stirring has stopped, and an overshoot decay pattern is identified at higher Reynolds numbers, which presents a faster decay rate as the constraint of flow domain size becomes influential. By discriminating the impact of convection on the viscosity results, the intrinsic viscosity can be evaluated with improved measurement accuracy.Xiao XiaoJürgen BrilloJonghyun LeeRobert W. HyersDouglas M. MatsonNature PortfolioarticleBiotechnologyTP248.13-248.65PhysiologyQP1-981ENnpj Microgravity, Vol 7, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biotechnology TP248.13-248.65 Physiology QP1-981
spellingShingle	Biotechnology TP248.13-248.65 Physiology QP1-981 Xiao Xiao Jürgen Brillo Jonghyun Lee Robert W. Hyers Douglas M. Matson Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility
description	Abstract Oscillating droplet experiments are conducted using the Electromagnetic Levitation (EML) facility under microgravity conditions. The droplet of molten metal is internally stirred concurrently with the pulse excitation initiating shape oscillations, allowing viscosity measurement of the liquid melts based on the damping rate of the oscillating droplet. We experimentally investigate the impact of convection on the droplet’s damping behavior. The effective viscosity arises and increases as the internal convective flow becomes transitional or turbulent, up to 2–8 times higher than the intrinsic molecular viscosity. The enhanced effective viscosity decays when the stirring has stopped, and an overshoot decay pattern is identified at higher Reynolds numbers, which presents a faster decay rate as the constraint of flow domain size becomes influential. By discriminating the impact of convection on the viscosity results, the intrinsic viscosity can be evaluated with improved measurement accuracy.
format	article
author	Xiao Xiao Jürgen Brillo Jonghyun Lee Robert W. Hyers Douglas M. Matson
author_facet	Xiao Xiao Jürgen Brillo Jonghyun Lee Robert W. Hyers Douglas M. Matson
author_sort	Xiao Xiao
title	Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility
title_short	Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility
title_full	Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility
title_fullStr	Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility
title_full_unstemmed	Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility
title_sort	impact of convection on the damping of an oscillating droplet during viscosity measurement using the iss-eml facility
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6c03e2714d924f1e98b9a71cf7210a80
work_keys_str_mv	AT xiaoxiao impactofconvectiononthedampingofanoscillatingdropletduringviscositymeasurementusingtheissemlfacility AT jurgenbrillo impactofconvectiononthedampingofanoscillatingdropletduringviscositymeasurementusingtheissemlfacility AT jonghyunlee impactofconvectiononthedampingofanoscillatingdropletduringviscositymeasurementusingtheissemlfacility AT robertwhyers impactofconvectiononthedampingofanoscillatingdropletduringviscositymeasurementusingtheissemlfacility AT douglasmmatson impactofconvectiononthedampingofanoscillatingdropletduringviscositymeasurementusingtheissemlfacility
_version_	1718377803387240448

Impact of convection on the damping of an oscillating droplet during viscosity measurement using the ISS-EML facility

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