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Updated: Sep 7, 2025
07:32
Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
Published on: April 10, 2017
9.1K
Three-Tier Hierarchical Structures for Extreme Pool Boiling Heat Transfer Performance.
Youngsup Song1, Carlos D Díaz-Marín1, Lenan Zhang1
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Advanced Materials (Deerfield Beach, Fla.)
|June 20, 2022
Summary
Researchers developed a novel three-tier hierarchical structure to overcome the trade-off between heat-transfer coefficient (HTC) and critical heat flux (CHF) in boiling. This design significantly enhances both HTC and CHF, promising major energy savings in boiling applications.
Area of Science:
- Heat transfer and thermodynamics
- Materials science and engineering
- Energy conversion and storage
Background:
- Boiling is a crucial energy transfer process in many applications.
- Boiling performance is characterized by heat-transfer coefficient (HTC) and critical heat flux (CHF).
- A trade-off typically exists between enhancing HTC and CHF, limiting simultaneous improvement.
Purpose of the Study:
- To overcome the intrinsic trade-off between HTC and CHF enhancement.
- To design and investigate a novel three-tier hierarchical structure for enhanced boiling performance.
- To achieve simultaneous significant enhancement of both HTC and CHF.
Main Methods:
- Designed a three-tier hierarchical structure combining microcavities, hemi-wicking structures, and nanostructures.
- Microcavities and hemi-wicking structures were used to define nucleation sites and minimize bubble coalescence, enhancing CHF.
- Nanostructures were incorporated to promote evaporation and compensate for reduced nucleation site density, enhancing HTC.
Main Results:
- The hierarchical structures achieved simultaneous enhancement of HTC by up to 389% and CHF by up to 138% compared to a smooth surface.
- The design effectively minimized bubble coalescence.
- The nanostructures successfully promoted evaporation for HTC enhancement.
Conclusions:
- The developed three-tier hierarchical structure successfully overcomes the HTC-CHF trade-off.
- This novel design leads to extreme boiling performance with significant HTC and CHF enhancements.
- The findings have the potential for substantial energy savings in various boiling applications.
Keywords:
critical heat fluxheat-transfer coefficienthierarchical structuresmicrostructuresnanostructuresphase-change heat transferMore Related Videos
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