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Related Experiment Videos

Ligament-mediated spray formation.

E Villermaux1, Ph Marmottant, J Duplat

  • 1Université de Provence and Institut Universitaire de France, IRPHE, 13384 Marseille CEDEX 13, France. villerma@irphe.univ-mrs.fr

Physical Review Letters
|March 5, 2004
PubMed
Summary

Fast gas streams over liquids create sprays with diverse fragment sizes. Ligament dynamics and drop coalescence are key to understanding these spray size distributions.

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Area of Science:

  • Fluid dynamics
  • Multiphase flow
  • Droplet formation

Background:

  • Spray formation from gas-liquid interactions results in a wide range of fragment sizes.
  • The process involves complex liquid topological changes, including ligament elongation and capillary breakup.
  • Coalescence of liquid volumes during ligament detachment leads to larger droplet formation.

Purpose of the Study:

  • To investigate the mechanisms governing fragment size distribution in gas-driven sprays.
  • To understand the role of liquid topology changes and droplet aggregation in spray formation.
  • To model the statistical properties of spray fragments.

Main Methods:

  • Analysis of liquid topology changes during spray formation.
  • Investigation of ligament elongation and capillary breakup dynamics.
  • Characterization of droplet coalescence and aggregation processes.

Main Results:

  • Spray formation involves sequential liquid topological changes, culminating in ligament breakup.
  • Ligament breakup and subsequent droplet coalescence significantly influence overall spray size distribution.
  • The size distribution of spray fragments is well-represented by gamma distributions, with an exponential tail.

Conclusions:

  • Ligament dynamics play a crucial role in establishing the broad statistical properties of sprays.
  • The aggregation of liquid volumes during ligament detachment is a primary factor in larger drop formation.
  • Understanding elementary distribution shapes, like gamma distributions, is key to modeling overall spray statistics.

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