On the variety of particle accumulation structures under the effect of g-jitters

Research output: Contribution to journalArticle

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49 Downloads (Pure)

Abstract

The present analysis extends the author's earlier work (Lappa, Phys. Fluids, vol. 25, 2003, 012101; Lappa, Chaos, vol. 23, 2003, 013105) on the properties of patterns formed by the spontaneous accumulation and ordering of solid particles in certain types of flow (with a toroidal structure and a travelling wave propagating in the azimuthal direction) by considering the potential impact of 'vibrations' (g-jitters) on such dynamics. It is shown that a kaleidoscope of possible variants exist whose nature and variety calls for a concerted analysis using the tools of computational fluid dynamics in synergy with dimensional arguments and existing theories on the effect of periodic accelerations on fluid systems. A possible categorization of the observed phenomena is introduced according to the type and scale of 'defects' displayed by the emerging particle aggregates with respect to unperturbed (vibration-less) conditions. It is shown that the resulting degree of 'turbulence' depends essentially on the direction (φ), amplitude (γ) and frequency (π{variant}) of the applied inertial disturbance. A range of amplitudes and frequencies exist where the formation of recognizable particle structures is prevented. A quantitative map (in the γ-π{variant}) for their occurrence is derived with the express intent of supporting the optimization of future experiments to be performed in space.

Original languageEnglish
Pages (from-to)160-195
Number of pages36
JournalJournal of Fluid Mechanics
Volume726
Early online date30 May 2013
DOIs
Publication statusPublished - Jul 2013

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Jitter
vibration
Fluids
Chaos theory
Computational fluid dynamics
Turbulence
fluids
computational fluid dynamics
traveling waves
Defects
chaos
emerging
disturbances
turbulence
occurrences
optimization
Experiments
defects

Keywords

  • Multiphase and particle-laden flows
  • Nonlinear dynamical systems
  • Pattern formation

Cite this

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abstract = "The present analysis extends the author's earlier work (Lappa, Phys. Fluids, vol. 25, 2003, 012101; Lappa, Chaos, vol. 23, 2003, 013105) on the properties of patterns formed by the spontaneous accumulation and ordering of solid particles in certain types of flow (with a toroidal structure and a travelling wave propagating in the azimuthal direction) by considering the potential impact of 'vibrations' (g-jitters) on such dynamics. It is shown that a kaleidoscope of possible variants exist whose nature and variety calls for a concerted analysis using the tools of computational fluid dynamics in synergy with dimensional arguments and existing theories on the effect of periodic accelerations on fluid systems. A possible categorization of the observed phenomena is introduced according to the type and scale of 'defects' displayed by the emerging particle aggregates with respect to unperturbed (vibration-less) conditions. It is shown that the resulting degree of 'turbulence' depends essentially on the direction (φ), amplitude (γ) and frequency (π{variant}) of the applied inertial disturbance. A range of amplitudes and frequencies exist where the formation of recognizable particle structures is prevented. A quantitative map (in the γ-π{variant}) for their occurrence is derived with the express intent of supporting the optimization of future experiments to be performed in space.",
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On the variety of particle accumulation structures under the effect of g-jitters. / Lappa, Marcello.

In: Journal of Fluid Mechanics, Vol. 726, 07.2013, p. 160-195.

Research output: Contribution to journalArticle

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