Nucleate boiling performance on nano/microstructures with different wetting surfaces

Area of Science:

• Heat transfer
• Surface science
• Nanotechnology

Background:

• Nucleate boiling is crucial for efficient heat transfer in various applications.
• Surface modification with nano/microstructures offers potential for enhanced boiling performance.
• Understanding wettability effects on boiling is essential for optimizing heat transfer surfaces.

Purpose of the Study:

• To investigate boiling heat transfer (BHT) and critical heat flux (CHF) on nano/microstructured surfaces.
• To compare the performance of surfaces with different wettabilities (silicon-oxidized and Teflon-coated).
• To elucidate the mechanisms behind enhanced BHT and CHF on these structured surfaces.

Main Methods:

• Fabrication of identical nano/microstructures with varying wettabilities.
• Conducting boiling experiments under atmospheric conditions.
• Analyzing bubble dynamics and measuring dynamic contact angles.

Main Results:

• Both BHT and CHF were enhanced on nano/microstructured surfaces, irrespective of wettability.
• The degree of BHT and CHF enhancement varied with surface wettability.
• Capillary-driven water penetration into surface structures was identified as a key mechanism for CHF enhancement.

Conclusions:

• Nano/microstructured surfaces significantly improve boiling heat transfer and critical heat flux.
• Surface wettability influences the extent of BHT and CHF enhancement.
• Capillary phenomena play a vital role in the enhanced performance of structured boiling surfaces.