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Modeling Dropwise Condensation on Hydrophobic Microgrooved Surface.

Simrandeep Bahal¹, Chander Shekhar Sharma¹

¹Thermofluidics Research Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Ropar, Rupnagar, 140 001 Punjab, India.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 7, 2023

Summary

Microgrooved hydrophobic surfaces enhance condensation heat transfer by promoting earlier droplet removal. Numerical modeling reveals spontaneous dewetting in microgrooves significantly boosts surface renewal and heat flux compared to planar surfaces.

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Area of Science:

Heat Transfer
Surface Science
Fluid Dynamics

Background:

Dropwise condensation heat transfer is crucial for thermal management.
Droplet departure from hydrophobic surfaces dictates heat transfer efficiency.
Microgrooved surfaces offer potential for enhanced condensation.

Purpose of the Study:

To numerically model dropwise condensation on microgrooved hydrophobic surfaces.
To analyze the various surface renewal mechanisms involved.
To investigate the impact of microgroove geometry on heat transfer.

Main Methods:

Extended a 1D modeling approach for condensation heat transfer.
Integrated individual droplet contributions for overall heat flux estimation.
Accounted for droplet growth, coalescence, imbibition, bulge formation, dewetting, and gravity shedding.

Main Results:

Microgrooves accelerate condensate shedding, reducing area coverage and increasing heat flux compared to planar surfaces.
Spontaneous dewetting of microgrooves was identified as the dominant surface renewal mechanism.
Optimal microgroove dimensions (depth ~200 μm, width <100 μm) enhance thermal performance.

Conclusions:

Microgrooved hydrophobic surfaces significantly improve condensation heat transfer.
Spontaneous dewetting is key to enhanced surface renewal on these structures.
Tailoring microgroove geometry is critical for optimizing heat transfer efficiency.