Pool Boiling Heat Transfer From Teflon-Coated Stainless Steel

Vachon, R. I.; Nix, G. H.; Tanger, G. E.; Cobb, R. O.

doi:10.1115/1.3580179

Cited by 23 publications

(3 citation statements)

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“…Numerous low-surface-energy materials coating have been tested to increase the liquid-surface contact angle on the inner wall of cavities and therefore increase the number of active nucleating sites . The typical materials are the polymer-based coatings, such as the polytetrafluoroethylene (PTFE) and polydimethylsiloxane (PDMS) with thin-film or patterned morphology, which make the wettability transition from hydrophilic to the hydrophobic/superhydrophilic surface. − However, because of the thermal cycling of the heating surface, the coating layer stripping from the surface cannot be sustained for a long time. The thicker coating layer has shown the potential to maintain robust hydrophobicity, but it typically has a large thermal resistance that reduces the heat transfer enhancement gained by increasing nucleation sites.…”

Section: Introductionmentioning

confidence: 99%

Pool Boiling Heat Transfer Enhanced by Fluorinated Graphene as Atomic Layered Modifiers

Yang

Jhang

et al. 2020

ACS Appl. Mater. Interfaces

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Graphene has been applied to thermal technology including boiling and condensation heat transfer, from which the pool boiling enhancement relies on adjusting the surface morphology and wettability that is favorable to catalyze the vaporization on the fluid/graphene interface. However, previous works using graphene or reduced graphene oxide (RGO) flake coatings, where the morphology of graphene coating is nonuniform and most of the underlying structured cavities are sealed by graphene flakes. For a long time, this hampered the unraveling of the mechanism behind the enhanced boiling performance by graphene coatings. Moreover, the previous work relied on using water-based pool boiling, which limits the scope of its practical applications since the versatile nonpolar refrigerant has been widely used in boiling heat transfer. The pool boiling was carried out on a plain copper surface to study the effect of fluorinated graphene (F-graphene) coating using nonpolar refrigerant R-141b as the working fluid along with bubble dynamic visualization. It was found that the increase of contact angle leads to more active cavities and enhances heat transfer performance up to twice as much, by applying the F-graphene coating. Moreover, the mechanism of graphene-enhanced heat transfer performance was unraveled and mainly attributed to the hydrophobic surface and effective cavity structure. This research provides a practical and reliable route for enhancing the heat transfer through F-graphene-coatings, which paves the way for potential application in graphene-based thermal technologies.

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Section: Introductionmentioning

confidence: 99%

Pool Boiling Heat Transfer Enhanced by Fluorinated Graphene as Atomic Layered Modifiers

Yang

Jhang

et al. 2020

ACS Appl. Mater. Interfaces

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“…As an alternative, since the contact angle of a liquid on a heated surface affects bubble nucleation, nonwetting surface coatings such as paraffin and Teflon have been investigated [9][10][11]. Since nonwetting coatings provide nucleation sites at a lowered surface superheat compared to wetting surfaces, nucleate boiling heat transfer is improved at low heat fluxes;…”

Section: Introductionmentioning

confidence: 99%

Investigation of boiling heat transfer in water using a free-particles-based enhancement technique

Kim

Garimella

2014

International Journal of Heat and Mass Transfer

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Enhancement of pool boiling heat transfer in water by means of the introduction of free particles on the heated surface is investigated. The layer of loose particles on the heated surface is free to move and deform under the action of bulk liquid convection and vapor nucleation. High-speed visualizations show that bubble nucleation preferentially occurs at the narrow corner cavities formed between the free particles and the heated surface. The effects of the number and size of the free particles are experimentally explored using copper particles over a wide size range from tens of nanometers to 13 mm.Experimental results show that a mixture of free particle diameters of 3 mm and 6 mm provides the greatest improvement in boiling heat transfer, resulting in an average increase in heat transfer coefficient of 115% relative to a baseline polished surface without particles. A numerical heat transfer simulation and an analytical force balance model are developed to predict nucleation incipience and explain the parametric trends in boiling performance observed in the presence of the free particles.

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“…How to design and fabricate copper-based high-efficiency boiling heat transfer (BHT) interfaces has attracted intensive interest in the past decades due to their values in fundamental research and technological innovations, e.g ., improving the efficiency of energy utilization and heat dissipation of thermal devices. − BHT is an endothermic process characterized by liquid–vapor phase transition. BHT performance is evaluated by three physical parameters: superheat for the onset of nucleation boiling (ONB), heat transfer coefficient (HTC), and critical heat flux (CHF), which reflect the beginning of liquid–vapor phase transition, heat transfer efficiency, and capability, respectively. − An ideal BHT interface requires lower superheat for ONB and higher HTC and CHF. To achieve lower superheat for ONB and higher HTC and CHF, several types of copper microfabrication technologies have been developed and commercialized, e.g ., micromachining, − copper wire mesh welding, , copper powder sintering, − and copper foam welding. − However, these traditional microfabrication technologies cannot support the development of next-generation ultrathin (≤0.5 mm) high-performance vapor chambers, where the thickness of BHT interfaces needs to be below 50 μm and their BHT performance needs to be superior …”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Boiling Heat Transfer Interfaces Composed of Electroplated Copper Nanocone Cores and Low-Thermal-Conductivity Nickel Nanocone Coverings

Chen

et al. 2020

ACS Appl. Mater. Interfaces

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We demonstrate that copper-based super-thin high-efficiency boiling heat transfer (BHT) interfaces can be obtained via electroplating hierarchical nickel nanocone coverings on the surface of copper nanocone cores. By regulating surface morphologies, wettability, and mass and heat transfer properties of hierarchical structures, we reveal the regulation rules of their performance. Based on this, we obtain the optimized BHT interfaces with a thickness of only 6.4 μm, which shows 228% enhancement in the maximal heat transfer coefficient, 71% enhancement in the critical heat flux, and 68% decrease in the superheat for the onset of nucleate boiling, as compared to the flat copper surface. Our studies clearly indicate that, although the in situ growth of nickel nanocones can unavoidably increase the interface thermal resistance of hierarchical structures, its optimization can still enhance BHT performance. This may be ascribed to the coupling of several interface effects such as more heat transfer area, more nucleation sites, smaller bubble departure sizes, and stronger liquid supply ability caused by hierarchical structures. Our work opens up a new avenue for the development of copper-based super-thin high-efficiency BHT interfaces, which would help enhance the efficiency of energy utilization and heat dissipation of various thermal devices.

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Pool Boiling Heat Transfer From Teflon-Coated Stainless Steel

Cited by 23 publications

References 0 publications

Pool Boiling Heat Transfer Enhanced by Fluorinated Graphene as Atomic Layered Modifiers

Pool Boiling Heat Transfer Enhanced by Fluorinated Graphene as Atomic Layered Modifiers

Investigation of boiling heat transfer in water using a free-particles-based enhancement technique

High-Efficiency Boiling Heat Transfer Interfaces Composed of Electroplated Copper Nanocone Cores and Low-Thermal-Conductivity Nickel Nanocone Coverings

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