Particle tracking for polydisperse sedimenting droplets in phase separation

@article{Lapp2012ParticleTF,
  title={Particle tracking for polydisperse sedimenting droplets in phase separation},
  author={Tobias Lapp and Martin Rohloff and J{\"u}rgen Vollmer and Bj{\"o}rn Hof},
  journal={Experiments in Fluids},
  year={2012},
  volume={52},
  pages={1187-1200}
}
When a binary fluid demixes under a slow temperature ramp, nucleation, coarsening and sedimentation of droplets lead to an oscillatory evolution of the phase-separating system. The advection of the sedimenting droplets is found to be chaotic. The flow is driven by density differences between two phases. Here, we show how image processing can be combined with particle tracking to resolve droplet size and velocity simultaneously. Droplets are used as tracer particles, and the sedimentation… 
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References

SHOWING 1-10 OF 40 REFERENCES
Interfacial dynamics in demixing systems with ultralow interfacial tension
We report measurements on fluid–fluid phase separation in a colloid–polymer mixture, which can be followed in great detail due to the ultralow interfacial tension. The use of the real-space
A reactive-flow model of phase separation in fluid binary mixtures with continuously ramped temperature
We suggest to revisit the phase separation of binary mixtures subjected to a sustained change of temperature from the point of view of reactive flows. Exploiting this new perspective, we describe the
Oscillations in the dynamics of temperature-driven phase separation
We examine the dynamics of the phase separation of a single phase of water-in-oil microemulsion droplets towards a phase of smaller droplets coexisting with a water-rich phase. Oscillations are
Phase separation in binary fluid mixtures with continuously ramped temperature
TLDR
This work considers the demixing of a binary fluid mixture, under gravity, which is steadily driven into a two–phase region by slowly ramping the temperature, and examines the interplay of two competing nonlinearities.
Asymmetric oscillations during phase separation under continuous cooling: A simple model.
TLDR
This work investigates the phase separation of binary mixtures under continuous cooling using the Cahn-Hilliard equation including the effect of gravity using a simple model and predicts an oscillatory variation of turbidity.
Phase separation under ultraslow cooling: Onset of nucleation.
  • J. Vollmer
  • Materials Science
    The Journal of chemical physics
  • 2008
TLDR
Stable diffusive demixing can only be achieved when special precautions are taken in experiments on real mixtures, and the recent observations on complex dynamical behavior in such systems should be considered as a new challenge for understanding generic features of phase-separating systems.
Collisions of Small Drops in a Turbulent Flow. Part I: Collision Efficiency. Problem Formulation and Preliminary Results
A mathematical approach to the calculation of the collision efficiency between droplets within a turbulent flow is suggested. The problem of drops’ hydrodynamic interaction is reconsidered taking
Emulsification in binary liquids containing colloidal particles: a structure-factor analysis.
TLDR
An image-analysis method that relies on structure factors obtained from discrete Fourier transforms of individual frames in confocal image sequences to clarify the link between quench conditions and resulting microstructure, paving the way for tailor-made particle-stabilized emulsions from binary liquids.
Theory of nucleation and growth during phase separation
We present a new model for the entire process of phase-separation that combines steady-state homogeneous nucleation theory with the classical Lifshitz-Slyozov mechanism of ripening, modified to
Review of Particle–Turbulence Interactions and Consequences for Cloud Physics
Abstract This paper summarizes recent progress on particle—turbulence interaction and discusses the possible implications for cloud physics. The subject is of considerable current interest as
...
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