Biphilic surface to improve and stabilize pool boiling in vacuum

Serdyukov, Vladimir; Patrin, Georgy; Malakhov, Ivan; Surtaev, Anton

doi:10.1016/j.applthermaleng.2022.118298

Cited by 28 publications

(8 citation statements)

References 59 publications

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“…The boiling heat transfer rate depended on the size of hydrophobic spots, the distance between them, and hence on their number. The results complement previous data [7,18] and show that heat transfer enhancement can be obtained on surfaces with a small diameter of hydrophobic regions (0.05 mm) and a relatively small area ratio (5%). At the same time, no significant effect of surface texture and shape of hydrophobic regions tested in this study on heat transfer was found.…”

supporting

confidence: 89%

“…Boiling is a complex process that depends on many factors, in particular, the roughness (structure) and wettability of the surface on which this process occurs. Recently, there has been an increase in boiling studies associated with the development of new micro/nano surface modification techniques that provide heat transfer enhancement [1][2][3][4][5][6][7]. Micro/nano modification includes both micro/nano surface structuring and application of thin coatings (nanocoatings).…”

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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supporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Boiling Heat Transfer Enhancement on Biphilic Surfaces

et al. 2022

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“…Serdyukov et al [ 61] 1.5 mm 10 mm Hydrophobic area: 124°H ydrophilic area: 70°N otable decrease in bubble departure diameters and a high increase in emission frequencies compared to bare surface.…”

Section: Laser-functionalized Superbiphilic Surfacesmentioning

confidence: 98%

Superbiphilic Laser‐Microengineered Surfaces with A Self‐Assembled Monolayer Coating for Exceptional Boiling Performance

Hadžić,

Može,

Zupančič

et al. 2023

Adv Funct Materials

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The rapid advancement of engineering systems has spurred the search for innovative thermal management solutions. Boiling, as a phase‐change heat transfer method, has shown promise in heat dissipation, but non‐functionalized surfaces struggle with increasing cooling demands. To improve heat dissipation efficiency across different heat loads, functionalized surfaces with tailored wettability have been proposed. Separately, superhydrophilic and superhydrophobic surfaces each offer benefits and drawbacks in boiling applications but combining them on a single “biphilic” surface simultaneously harnesses their advantages. In this study, laser‐functionalized copper surfaces with spatially tailored wettability are developed by combining two‐step laser texturing with a self‐assembled monolayer coating, while focus is placed on the impact of the size and pitch of superhydrophobic spots. The developed functionalized surfaces exhibit exceptional boiling performance with heat transfer coefficients up to 299 kW m−2 K−1, a 434% enhancement over untreated surfaces. Optimal ratios of superhydrophilic and superhydrophobic areas and optimal spot pitch are identified. Additionally, varying behavior at different heat flux levels is observed, emphasizing the importance of considering thermal loads when determining the optimal surface pattern. This advancement in performance, along with the rapid and cost‐effective functionalization process, represents a significant breakthrough for enhanced thermal management applications.

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“…Many researchers have focused on an exploration of the basic physical principle and practical meaning as related to liquid-solid interaction, including drop impact on micro-and nano-structured surfaces [16][17][18][19][20][21][22][23][24][25][26][27][28]. Bird et al [16] studied that superhydrophobic surfaces with macrotextures could decrease the contact time of millimeter-sized water drops by means of center-assisted retraction.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the head-on impact on macrotexture, Han et al [18] presented fin-stripe non-wettable surfaces for spatial offset maximization and temporal contact minimization of bouncing drops. Other methods have been developed to functionalize the surfaces and modify the performance: vitrimer thin films for durable hydrophobicity [19], functionalized copper surfaces [20], and biphilic surfaces [21] for enhanced heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Bounce and Separation Dynamics of Janus Drop on Macrotextured Surface

Choi

Yun

2022

Polymers

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Janus drops are thermodynamically stable when a high-viscosity fluid is imposed on a low-viscosity fluid. To understand physical mechanisms in Janus drop impact on macrotextured surfaces, several challenges in finding parameters or strategies still remain. Here, this study investigates the asymmetric bounce and separation of impinging Janus drops on non-wettable surfaces decorated with a macroridge to explore the effect of the drop size, viscosity ratio, and ridge size on the dynamics. Through numerical simulations, we determine the threshold Weber number, above which separation occurs, by varying drop diameters and viscosity ratios of the Janus drops. We investigate the initial bouncing directions of separated drops as a function of the impact velocity and viscosity ratio. We also predict how the separation efficiency is affected by the ridge’s height and width. The asymmetric impact dynamics of Janus drops on macrotextured surfaces can provide new strategies to control drop bouncing in applications, such as liquid separation and purification.

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Biphilic surface to improve and stabilize pool boiling in vacuum

Cited by 28 publications

References 59 publications

Boiling Heat Transfer Enhancement on Biphilic Surfaces

Boiling Heat Transfer Enhancement on Biphilic Surfaces

Superbiphilic Laser‐Microengineered Surfaces with A Self‐Assembled Monolayer Coating for Exceptional Boiling Performance

Characterizing the Bounce and Separation Dynamics of Janus Drop on Macrotextured Surface

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