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Numerical Simulation of Jumping Droplet Condensation
Patrick Birbarah, Shreyas Chavan, Nenad Miljkovic1
1International Institute for Carbon Neutral Energy Research (WPI-I2CNER) , Kyushu University , 744 Moto-oka , Nishi-ku, Fukuoka 819-0395 , Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2019
Summary
Jumping droplet condensation significantly boosts heat transfer by minimizing droplet size. This study develops a 3D simulation to understand steady-state droplet distribution and identify design criteria for enhanced heat transfer surfaces.
Area of Science:
- Thermodynamics
- Fluid Dynamics
- Materials Science
Background:
- Jumping droplet condensation enhances heat transfer by ~100% compared to dropwise condensation.
- This phenomenon relies on reducing the time-averaged droplet size on the condensing surface to approximately 10 μm.
Purpose of the Study:
- To develop a rigorous 3D numerical simulation for jumping droplet condensation.
- To compute the steady-state time-averaged droplet size distribution.
- To establish design criteria for nonwetting surfaces to improve heat transfer.
Main Methods:
- Developed a three-dimensional numerical simulation model.
- Tracked maximum droplet radii (Rmax) to determine steady-state criteria.
- Investigated effects of minimum jumping radius, contact angle, and droplet growth rate.
Main Results:
- Achieved a numerical fit for droplet size distribution with R² > 0.995.
- Evaluated heat transfer performance, showing excellent agreement with experimental data.
- Identified droplet size mismatch during coalescence as a factor impeding steady state and introduced a new flooding mechanism.
Conclusions:
- The simulation provides a unified model for jumping droplet condensation applicable to various conditions.
- Design criteria for nonwetting surfaces were demonstrated for enhanced heat transfer.
- Understanding droplet dynamics is crucial for optimizing condensation heat transfer performance.
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