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/ | ||||||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||||||
Title: | Spreading of droplets under various gravitational accelerations | ||||||||||||||||||||||||||||
Authors: |
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Date: | 4 November 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: | 29 Nov 2023 14:53 |
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