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Updated: Dec 28, 2025
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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 Enhanced by Fluorinated Graphene as Atomic Layered Modifiers.
Ching-Yuan Su1,2, Chien-Yuh Yang1,2, Bo-Wei Jhang1
1Dep. of Mechanical Engineering, National Central University, Tao-Yuan 32001, Taiwan.
ACS Applied Materials & Interfaces
|February 11, 2020
Summary
Fluorinated graphene (F-graphene) coatings enhance pool boiling heat transfer up to two times by increasing surface hydrophobicity and cavity activation. This study reveals the mechanism for improved performance using nonpolar refrigerants.
Area of Science:
- Materials Science
- Thermal Engineering
- Surface Chemistry
Background:
- Graphene and reduced graphene oxide (RGO) coatings have shown promise for enhancing heat transfer, but their non-uniform morphology and sealed cavities limit performance understanding.
- Previous studies primarily used water-based pool boiling, restricting applications with widely used nonpolar refrigerants.
Purpose of the Study:
- To investigate the effect of fluorinated graphene (F-graphene) coatings on pool boiling heat transfer performance using a nonpolar refrigerant.
- To elucidate the mechanism behind graphene-enhanced boiling heat transfer.
Main Methods:
- Pool boiling experiments were conducted on a plain copper surface coated with F-graphene.
- Nonpolar refrigerant R-141b was used as the working fluid.
- Bubble dynamics were visualized to analyze the boiling process.
Main Results:
- F-graphene coating significantly enhanced heat transfer performance, achieving up to double the enhancement compared to uncoated surfaces.
- Increased surface contact angle correlated with more active cavities and improved heat transfer.
- The enhancement mechanism was attributed to the hydrophobic nature of the F-graphene surface and the effective cavity structure.
Conclusions:
- Fluorinated graphene coatings offer a practical and effective method for enhancing pool boiling heat transfer.
- The study clarifies the mechanism involving surface hydrophobicity and cavity activation, crucial for nonpolar refrigerant applications.
- This research paves the way for advanced graphene-based thermal management technologies.
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