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Spreading of droplets under various gravitational accelerations

D'Angelo, Olfa and Kuthe, Felix and van Nieuwland, Kasper and Janssen, Clint Ederveen and Voigtmann, Thomas and Jalaal, Maziyar (2022) Spreading of droplets under various gravitational accelerations. Review of Scientific Instruments, 93, p. 115103. American Institute of Physics (AIP). doi: 10.1063/5.0105624. ISSN 0034-6748.

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Abstract

We describe a setup to perform systematic studies on the spreading of droplets of complex fluids under microgravity conditions. Tweaking the gravitational acceleration under which droplets are deposited provides access to different regimes of the spreading dynamics, as quantified through the Bond number. In particular, microgravity allows us to form large droplets while remaining in the regime where surface tension 2effects and internal driving stresses are predominant over hydrostatic forces. The VIP-DROP (VIsco-Plastic DROPlets on the DROP tower) experimental module provides a versatile platform to study a wide range of complex fluids through the deposition of axisymmetric droplets. The module offers the possibility to deposit droplets on a precursor layer, which can be composed of the same or a different fluid. Furthermore, it allows us to deposit four droplets simultaneously while conducting shadowgraphy on all of them and observing either the flow field (through particle image velocimetry) or the stress distribution inside the droplet in the case of stress birefringent fluids. It was developed for a drop tower catapult system, is designed to withstand a vertical acceleration of up to 30 times the Earth's gravitational acceleration in the downward direction, and is capable of operating remotely under microgravity conditions. We provide a detailed description of the module and an exemplary data analysis for droplets spreading on-ground and in microgravity.

Item URL in elib:https://elib.dlr.de/189719/
Document Type:Article
Title:Spreading of droplets under various gravitational accelerations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
D'Angelo, OlfaFriedrich-Alexander-Universität Erlangen-Nürnberghttps://orcid.org/0000-0002-7218-4596
Kuthe, FelixFH KölnUNSPECIFIED
van Nieuwland, KasperUniversity of AmsterdamUNSPECIFIED
Janssen, Clint EderveenUniversity of AmsterdamUNSPECIFIED
Voigtmann, ThomasThomas.Voigtmann (at) dlr.dehttps://orcid.org/0000-0002-1261-9295
Jalaal, MaziyarUniversity of Amsterdamhttps://orcid.org/0000-0002-5654-8505
Date:2022
Journal or Publication Title:Review of Scientific Instruments
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:93
DOI:10.1063/5.0105624
Page Range:p. 115103
Publisher:American Institute of Physics (AIP)
ISSN:0034-6748
Status:Published
Keywords:rheology; complex fluids; droplet spreading; viscoplastic materials; microgravity; drop tower
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 - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:07 Nov 2022 08:53
Last Modified:07 Nov 2022 08:53

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