Is there an equation for predicting when a stream breaks into droplets?

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SUMMARY

The discussion centers on the prediction of droplet formation in liquid streams, specifically referencing the Rayleigh instability. Participants confirm that the Rayleigh-Plateau instability equation is crucial for understanding when a liquid stream, such as water or ethanol, breaks into droplets. Key factors influencing this phenomenon include the stream's speed and diameter, which are integral to the equation's application. The conversation emphasizes the importance of these parameters in predicting droplet formation accurately.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with the Rayleigh-Plateau instability theory
  • Knowledge of stream velocity and diameter measurements
  • Basic mathematical skills for applying equations
NEXT STEPS
  • Research the Rayleigh-Plateau instability equation in detail
  • Explore fluid dynamics simulations using software like ANSYS Fluent
  • Study the effects of varying stream diameters on droplet formation
  • Investigate experimental methods to measure droplet formation in liquids
USEFUL FOR

Researchers in fluid dynamics, physicists studying liquid behavior, and engineers working on spray technologies will benefit from this discussion.

leorex
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I was just wondering, is there any equation which predicts when does a stream of liquid( e.g water, ethanol) break into droplets? i think it relates to the speed and diameter of the stream, probably also with diameter, but i cannot find any equations which governs the rule
 
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google "rayleigh instability".
 

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