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Inversion of Stabilized Large Droplet Clusters.

Alexander A Fedorets1, Eduard E Kolmakov1, Leonid A Dombrovsky1,2

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Microdroplet clusters spontaneously rearrange on a heated water layer. The droplet diameter ratio, or "inversion coefficient," dictates this inversion, with larger droplets moving inward due to air-vapor flow drag.

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Area of Science:

  • Fluid dynamics
  • Microscale phenomena
  • Surface tension

Background:

  • Self-assembled microdroplet clusters levitate on a heated water layer.
  • Droplet rearrangement, or inversion, is observed within these clusters.
  • The air-vapor flow field influences droplet behavior.

Purpose of the Study:

  • Investigate the spontaneous rearrangement of microdroplets in levitating clusters.
  • Determine the factors controlling the onset of cluster inversion.
  • Understand the role of droplet size, drag, and rotation in rearrangement.

Main Methods:

  • Experimental setup with a levitating microdroplet cluster on a heated water layer.
  • Analysis of droplet dynamics and rearrangement using the "inversion coefficient" (center-to-periphery droplet diameter ratio).
  • Consideration of air-vapor flow dynamics and droplet rotation effects.

Main Results:

  • The inversion coefficient is identified as the key parameter controlling cluster inversion.
  • Larger droplets move towards the center due to increased drag from the air-vapor flow.
  • Droplet rotation significantly impacts inversion in smaller clusters due to viscous friction.

Conclusions:

  • Cluster inversion is driven by differential drag forces on droplets of varying sizes.
  • Droplet rotation is a critical factor in inversion dynamics for smaller clusters.
  • Avoiding cluster inversion is crucial for experiments requiring precise droplet tracking.