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Boiling Transitions During Droplet Contact on Superheated Nano/Micro-Structured Surfaces
Navid Saneie1, Varun Kulkarni1, Kamel Fezzaa2
1Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States.
ACS Applied Materials & Interfaces
|March 28, 2022
Summary
Surface texture design paradoxically increases the Leidenfrost temperature (T_LFP) at critical spacings, but this may not enhance heat transfer due to hydrodynamic instabilities and vapor jetting.
Area of Science:
- Fluid dynamics
- Heat transfer
- Surface science
Background:
- Surface topography manipulation is key for optimizing droplet interactions with hot surfaces.
- Droplet behavior includes immediate boiling, splashing, or Leidenfrost effect on superheated surfaces.
Purpose of the Study:
- Investigate water droplet behavior on nano/microtextured surfaces across various temperatures.
- Analyze the impact of surface texture spacing on Leidenfrost temperature (T_LFP).
Main Methods:
- High-speed optical and X-ray imaging techniques were employed.
- Experiments involved water droplets gently contacting designed nano/microtextured surfaces.
- A wide range of temperatures and texture spacings were studied.
Main Results:
- A paradoxical increase in T_LFP was observed as texture spacing decreased below ~10 μm.
- Droplet behavior on fine textures is dominated by hydrodynamic instabilities, not just boiling.
- A novel regime of splashing with vapor jet penetration before Leidenfrost transition was identified.
Conclusions:
- Reduced texture spacing can increase T_LFP but may not improve heat transfer.
- Hydrodynamic instabilities and vapor jetting play critical roles in droplet dynamics.
- A comprehensive boiling behavior map for textured surfaces has implications for various industrial applications.
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