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Doctoral Research
Doctoral Dissertation:
“Elasto-hydrodynamic and thermofluidic instabilities in complex fluid droplets”.
Thesis advisors:
1. Magneto-elastic effect in non-Newtonian ferrofluid droplets impacting superhydrophobic surfaces
1.1) Droplet impact ferrohydrodynamics
Magnetic Bond number
(Bom) ~0
Magnetic Bond number
(Bom) ~75
Newtonian Ferrofluid droplet
[P0-F2.5]
non-Newtonian Ferrofluid droplet
[P5-F2.5]
1.2) Droplet rebound suppression dynamics
Droplet rebound with pinch-off
Droplet fragmentation
Droplet breakup during retraction
Droplet rebound suppression
2. Triggering of electro-elastic anti-superhydrophobicity during non-Newtonian droplet collision
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2.1) Spreading electrohydrodynamics
electric Eotvos number
(Eoe) ~0
electric Eotvos number
(Eoe) ~12
non-Newtonian droplet
[P5-T0]
non-Newtonian dielectric droplet
[P5-T5]
2.2) Droplet rebound suppression dynamics of non-Newtonian dielectric droplet
Eoe ~ 0
(Droplet rebound)
Eoe ~ 1.8
(Droplet rebound)
Eoe ~ 3.2
(Droplet rebound)
Eoe ~ 12
(rebound suppression)
3. Postponement of dynamic Leidenfrost phenomenon during droplet impact of surfactant solutions
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3.1) Leidenfrost droplet
3.2) Surfactant Leidenfrost droplets
0 CMC
0.125 CMC
1 CMC
3.3) Trampolining dynamics
Ts ~400deg, [U=0.5m/s]
3.4) Central jet ejecting dynamics
Ts ~400deg, [U=1m/s]
4. Augmenting the Leidenfrost temperature of droplets via nanobubble dispersion
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4.1) CCR mode of boiling in nanobubbles loaded droplet
87million bubbles/ml
104 million bubbles/ml
214 million bubbles/ml
4.2) Macrobubble formation inside the liquid droplet during Leidenfrost stage
87million bubbles/ml, at Ts ~ 290deg