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Three-Tier Hierarchical Structures for Extreme Pool Boiling Heat Transfer Performance.
- Source :
- Advanced materials (Deerfield Beach, Fla.); vol 34, iss 32, e2200899; 0935-9648
- Publication Year :
- 2022
-
Abstract
- Boiling is an effective energy-transfer process with substantial utility in energy applications. Boiling performance is described mainly by the heat-transfer coefficient (HTC) and critical heat flux (CHF). Recent efforts for the simultaneous enhancement of HTC and CHF have been limited by an intrinsic trade-off between them-HTC enhancement requires high nucleation-site density, which can increase bubble coalescence resulting in limited CHF enhancement. In this work, this trade-off is overcome by designing three-tier hierarchical structures. The bubble coalescence is minimized to enhance the CHF by defining nucleation sites with microcavities interspersed within hemi-wicking structures. Meanwhile, the reduced nucleation-site density is compensated for by incorporating nanostructures that promote evaporation for HTC enhancement. The hierarchical structures demonstrate the simultaneous enhancement of HTC and CHF up to 389% and 138%, respectively, compared to a smooth surface. This extreme boiling performance can lead to significant energy savings in a variety of boiling applications.
Details
- Database :
- OAIster
- Journal :
- Advanced materials (Deerfield Beach, Fla.); vol 34, iss 32, e2200899; 0935-9648
- Notes :
- application/pdf, Advanced materials (Deerfield Beach, Fla.) vol 34, iss 32, e2200899 0935-9648
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1378686018
- Document Type :
- Electronic Resource