Projects per year
Abstract
The emergence of particle accumulation structures (PAS) in noncylindrical liquid bridges (LBs) is studied numerically for a high Prandtl number liquid considering microgravity conditions. Simulations are conducted in the framework of a finite-volume (Eulerian) approach with nonisodense particles tracked using a Lagrangian, one-way coupling scheme. First, the threshold of the Marangoni-flow instability is determined as a function of the aspect ratio and the volume of liquid held between the supporting disks, thereafter, PAS formation is investigated for supercritical conditions. The overall approach is specifically conceived to provide details about the morphological evolution of these structures as the main control parameters are varied. For this reason a set of dedicated notions and definitions (such as the linear extension of the PAS, its inner core radius, and the area of the "petals"or "blades") are introduced to allow a precise quantification of a series of purely geometrical effects. Though the analysis is deliberately limited to illustrating the macroscopic patterning behavior and its relationship with the overarching factors, a model is proposed to interpret the increased ability of slender (concave) LBs to support the formation of PAS over extended ranges of values of the particle Stokes number. This model yet relies on essentially geometrical arguments, that is, the triadic relationship among the curvature of the free surface, the topology of fluid streamlines, and particle mass effects.
Original language | English |
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Article number | 084304 |
Number of pages | 30 |
Journal | Physical Review Fluids |
Volume | 5 |
Issue number | 8 |
DOIs | |
Publication status | Published - 14 Aug 2020 |
Keywords
- liquid bridges
- particle accumulation structures
- thermocapillary flow
- microgravity
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Dive into the research topics of 'Particle accumulation structures in non-cylindrical liquid bridges under microgravity conditions'. Together they form a unique fingerprint.Projects
- 1 Finished
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The ESA/JAXA JEREMI (Japanese European Research Experiments on Marangoni Instabilities) - Project
Lappa, M. (Principal Investigator)
EPSRC (Engineering and Physical Sciences Research Council)
10/12/18 → 9/12/20
Project: Research
Datasets
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Data for: "Particle accumulation structures in noncylindrical liquid bridges under microgravity conditions"
Capobianchi, P. (Creator) & Lappa, M. (Contributor), University of Strathclyde, 2 Feb 2021
DOI: 10.15129/e1584635-1b03-4a20-950c-b1172b410ec1
Dataset