Experimental Study of Pool Boiling on Heaters with Nanomodified Surfaces under Saturation

Khmel, S. Ya.; Баранов, Е. А.; Vladimirov, V Yu; Сафонов, А. И.; Chinnov, E. A.

doi:10.1080/01457632.2021.2009211

Cited by 9 publications

(5 citation statements)

References 50 publications

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“…The contact angle for the array of micrococoons was 36±2°, and after fluoropolymer deposition above micrococoons, it was 164±2°. For samples hydrophobized with fluorinated methoxysilane, the contact angle was about 170±2° in ablated regions [7].…”

Section: Biphilic Surfaces With Arrays Of Superhydrophobic Cavernsmentioning

confidence: 99%

“…Silicon oxide nanowires on tin catalyst particles were synthesized by gas jet electron beam plasma chemical vapor deposition. The process of synthesizing arrays of micrococoons from SiOx nanowires on copper heater surfaces is described in more detail in [7]. Figure 1(a) shows the surface morphology with micrococoon arrays of silicon oxide nanowires before the application of a hydrophobic layer (fluoropolymer film).…”

Section: Biphilic Surfaces With Fluoropolymer Spotsmentioning

confidence: 99%

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Boiling heat transfer on modified copper surfaces with inhomogeneous wettability

Vladimirov,

Khmel,

Chinnov

2023

E3S Web Conf.

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Experiments were carried out on biphilic surfaces made using two technologies. The first technology was the deposition of a fluoropolymer through special masks (100 μm spots and 500 μm pitch; 50 μm spots and 200 μm pitch) onto a smooth or pre-modified (silica micrococoon arrays) copper surface. The second technology consisted in the deposition of fluorinated methoxysilane on a copper surface with arrays of caverns preliminarily created by laser ablation (caverns size of the order of 70 μm, pitch - 780 μm), as a result of which deposition the caverns became superhydrophobic. The experiments were carried out on distilled water at atmospheric pressure. For all surfaces, a significant intensification of heat transfer has been achieved, compared with a smooth copper surface. All described biphilic surfaces were compared with similar surfaces without hydrophobic treatment, that is, non-biphilic (smooth surface, arrays of micrococoons, arrays of caverns). For all surfaces, the key contribution of biphilic properties to the intensity of heat transfer is shown in comparison with other related types of processing.

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Section: Biphilic Surfaces With Arrays Of Superhydrophobic Cavernsmentioning

confidence: 99%

Section: Biphilic Surfaces With Fluoropolymer Spotsmentioning

confidence: 99%

Boiling heat transfer on modified copper surfaces with inhomogeneous wettability

Vladimirov,

Khmel,

Chinnov

2023

E3S Web Conf.

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“…Silicon oxide nanowires on tin catalyst particles were synthesized by gas-jet electron beam plasma chemical vapor deposition. The procedure for synthesizing arrays of micrococoons from SiO x nanowires on copper heater surfaces is described in detail in [25]. SiO x was chosen for the synthesis due to its high chemical and thermal stability.…”

Section: Biphilic Surfaces and Their Fabrication Processmentioning

confidence: 99%

“…SiO x was chosen for the synthesis due to its high chemical and thermal stability. Such micro/nanostructures show the greatest resistance to destruction by boiling compared to other structures [25,31]. Figure 1a shows the surface morphology with arrays of micrococoons from silicon oxide nanowires before the deposition of the hydrophobic layer (fluoropolymer film).…”

Section: Biphilic Surfaces and Their Fabrication Processmentioning

confidence: 99%

“…At the same time, the findings of the previous studies are contradictory: for example, in [12,14], it is stated that the heat transfer coefficient (HTC) depends weakly on the area ratio, whereas in [8,21], the optimal values of the area ratio are given, but they are different: 38.46% and 23%, respectively. We also note that the aging problem is not considered in papers on biphilic surfaces, although it is fundamental, as for any micro/nanomodified surface [24,25]. Further improvement in boiling heat transfer on biphilic surfaces can be achieved by preliminary micro/nanostructuring [8,13,26]; in particular, laser methods are promising for micro/nanostructuring [21].…”

Section: Introductionmentioning

confidence: 99%

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Boiling Heat Transfer Enhancement on Biphilic Surfaces

et al. 2022

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Flat surfaces with different patterns of hydrophobic spots were employed for experimental investigation of boiling heat transfer. In one case, hydrophobic spots were created on a smooth copper surface and on a surface coated with arrays of micrococoons from silicon oxide nanowires by vapor deposition of a fluoropolymer. In the second case, a hydrophobic coating was deposited on heater surfaces with cavity microstructures formed by laser ablation and chemisorption of fluorinated methoxysilane. Water under saturation conditions at atmospheric pressure was used as the working liquid. The temperature of the heating surface was varied from 100 to 125 °C, and the maximum value of the heat flux was 160 W/cm2. Boiling heat transfer on the test biphilic surfaces was significantly (up to 600%) higher than on non-biphilic surfaces. Surface texture, the shape of hydrophobic regions, and the method of their creation tested in this study did not show a significant effect on heat transfer. The boiling heat transfer rate was found to depend on the size of hydrophobic spots, the distance between them, and hence the number of spots. The highest heat transfer efficiency was detected for the surface with the largest number of hydrophobic spots. After long-term experiments (up to 3 years), the heat transfer coefficient on the obtained surfaces remained higher than on the smooth copper surface. Biphilic surfaces with arrays of cavities formed by laser ablation turned out to be the most stable during prolonged contact with boiling water.

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Boiling mechanism of biphilic surfaces based on Helmholtz instability and Taylor instability

Xiang,

Song,

Yang

et al. 2024

International Journal of Multiphase Flow

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Experimental Study of Pool Boiling on Heaters with Nanomodified Surfaces under Saturation

Cited by 9 publications

References 50 publications

Boiling heat transfer on modified copper surfaces with inhomogeneous wettability

Boiling heat transfer on modified copper surfaces with inhomogeneous wettability

Boiling Heat Transfer Enhancement on Biphilic Surfaces

Boiling mechanism of biphilic surfaces based on Helmholtz instability and Taylor instability

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