COALESCENCE-INDUCED DROPLET PROPULSION

Coalescence between droplets with different surface tension, on different substrates, can induce motion (Marangoni effect).
Here the experiment shows an ethanol drop pushing a water droplet on a hydrophilic substrate can induce large motions at large velocities.

 
 
 
 
 
Collaboration with Mathieu Sellier and Volker Nock (University of Canterbury, NZ)

INTERACTIONS BETWEEN DROPLETS

t = 0s t = 10s t = 10.8s

t = 12.4s t = 16.8s t = 21.6s
Coalescence between two PIB droplets in PDMS including velocity field (PIV)

  • Influence of viscosity ratio on drop morphological changes
  • PIV measurements
  • Numerical simulation 


    • INTERFACIAL TENSION MEASUREMENTS
    IT vs. copolymer %
    Interfacial tension vs. volume copolymer content for a PP/PA6 system

  • Spinning drop tensiometer: Collaboration with Prof. Daniel D. Joseph
    • Dept. of Aero. Eng. and Mechanics, University of Minnesota (USA)

  • High temperature measurements of IT for various polymeric systems : influence of copolymers, copolymers diffusion constants


    • INTRIGUING DROPLET BREAK-UPS
  • Phase-field approach
  • Collaboration with Prof. Thierry Biben
  • Relaxation of droplets following elongation.
  • Viscoelastic effects
    •    
    Relaxation Patterns starting from different stretch ratios L/R