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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
Published on: April 10, 2017
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
Sujith Kumar C S1, Yao Wen Chang1, Ping-Hei Chen2
1Department of Mechanical Engineering, National Taiwan University.
Journal of Visualized Experiments : Jove
|April 28, 2017
Summary
This study enhanced heat transfer using hybrid wettable patterns on copper surfaces. Optimizing the number and orientation of these patterns significantly improved the heat-transfer coefficient (HTC) by controlling bubble dynamics.
Area of Science:
- Materials Science
- Heat Transfer Engineering
- Surface Science
Background:
- Pool-boiling heat transfer is crucial in many industrial applications.
- Surface wettability plays a significant role in enhancing boiling performance.
- Hybrid wettable surfaces offer potential for improved heat transfer characteristics.
Purpose of the Study:
- To investigate the impact of interline number and orientation on pool-boiling heat transfer.
- To evaluate the performance of hybrid wettable patterns on cylindrical copper surfaces.
- To understand the relationship between surface characteristics, bubble dynamics, and heat transfer.
Main Methods:
- Fabrication of hybrid wettable patterns by coating superhydrophilic SiO2 on hydrophobic copper surfaces.
- Pool-boiling heat-transfer experiments using de-ionized water on treated copper cylinders (25-mm diameter, 40-mm length).
- Analysis of heat-transfer coefficient (HTC) and visualization of bubble formation using a CCD camera.
Main Results:
- Increasing the number of interlines enhanced the HTC compared to plain surfaces.
- Bubble formation was more prevalent on the interlines.
- The hybrid wettable pattern with a hydrophobic lowermost section yielded the best HTC.
Conclusions:
- Both the number and orientation of hybrid wettable patterns significantly influence wall superheat and HTC.
- Bubble dynamics on the surface are a critical factor determining nucleate boiling efficiency.
- Optimized hybrid wettable patterns show promise for enhancing pool-boiling heat transfer.
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