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Sailing Droplets in Superheated Granular Layer.

Dongdong Liu1, Thien-Binh Nguyen1, Ngoc-Vu Nguyen1

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Droplet impact on superheated granular layers causes instability. Vapor evaporation can lead to droplet sailing, driven by metallic grain fluidization, with a predictive model offered.

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Area of Science:

  • Physics of granular materials
  • Fluid dynamics
  • Heat and mass transfer

Background:

  • Superheated granular layers exhibit complex behaviors under external stimuli.
  • Droplet impact introduces thermal and mechanical perturbations.
  • Vapor evaporation plays a critical role in multiphase granular flows.

Purpose of the Study:

  • To investigate the instability of superheated granular layers upon droplet impact.
  • To understand the mechanisms driving droplet motion (trapping or sailing) post-deposition.
  • To develop a predictive model for droplet sailing based on granular fluidization criteria.

Main Methods:

  • Experimental deposition of droplets onto superheated metallic granular layers.
  • Observation and analysis of droplet-vapor-grain interactions.
  • Development and validation of a theoretical model for fast fluidization and pressure distribution.

Main Results:

  • Droplet impact induces instabilities in the superheated granular layer.
  • Evaporating vapor can cause the droplet to either be trapped or sail away.
  • Sailing motion is linked to unstable pressure distributions from fast fluidization of grains.

Conclusions:

  • The study elucidates the conditions leading to droplet sailing on superheated granular layers.
  • A predictive model based on fast fluidization criteria successfully describes the enabling conditions for sailing.
  • Findings offer insights into granular material dynamics and multiphase flow phenomena.