Achieving robust and enhanced pool boiling heat transfer using micro–nano multiscale structures

Wang, Xiaoliang; Xu, Jie; Jiang, Hongpeng; Liu, Yongda; Li, Xinru; Shan, Debin; Guo, Baochun

doi:10.1016/j.applthermaleng.2023.120441

Cited by 19 publications

(10 citation statements)

References 61 publications

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“… Comparison of the pool boiling performance of literature-reported surfaces [ 14 , 15 , 32 , 34 , 36 , 40 , 41 , 42 , 43 , 44 , 45 , 64 , 65 , 66 ] and the surfaces presented in this study. …”

Section: Figurementioning

confidence: 99%

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Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Hadžić,

Može,

Zupančič

et al. 2024

Nanomaterials

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The rapid progress of electronic devices has necessitated efficient heat dissipation within boiling cooling systems, underscoring the need for improvements in boiling heat transfer coefficient (HTC) and critical heat flux (CHF). While different approaches for micropillar fabrication on copper or silicon substrates have been developed and have shown significant boiling performance improvements, such enhancement approaches on aluminum surfaces are not broadly investigated, despite their industrial applicability. This study introduces a scalable approach to engineering hierarchical micro-nano structures on aluminum surfaces, aiming to simultaneously increase HTC and CHF. One set of samples was produced using a combination of nanosecond laser texturing and chemical etching in hydrochloric acid, while another set underwent an additional laser texturing step. Three distinct micropillar patterns were tested under saturated pool boiling conditions using water at atmospheric pressure. Our findings reveal that microcavities created atop pillars successfully facilitate nucleation and micropillars representing nucleation site areas on a microscale, leading to an enhanced HTC up to 242 kW m−2 K−1. At the same time, the combination of the surrounding hydrophilic porous area enables increased wicking and pillar patterning, defining the vapor–liquid pathways on a macroscale, which leads to an increase in CHF of up to 2609 kW m−2.

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Section: Figurementioning

confidence: 99%

“…On the other hand, HTC enhancement was ascribed to nucleation promoted by microscale cavities. Wang et al [ 40 ] developed multiscale aluminum surfaces to study the influence of various wetting states on boiling performance. They showed improvement in CHF and HTC by 162.1% and 180.8% compared to the flat sample, respectively.…”

Section: Introductionmentioning

confidence: 99%

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Hadžić,

Može,

Zupančič

et al. 2024

Nanomaterials

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“…Through experimentation, the study concluded that the introduction of macro-textured groove arrays realized preferential nucleation, and enabled the large droplets to propel themselves to detach from the surface, resulting in an approximately 50% decrease in the maximum diameter of the droplets on the condensation surface. In addition, the superhydrophilic surface could provide cooling liquid to the heating area under the action of strong capillary forces, thereby improving boiling heat transfer [271,272]. Wang et al [272] fabricated a superhydrophilic macro/micro/nanostructured surface by combining hot embossing and hydrothermal treatment.…”

Section: Heat Transfermentioning

confidence: 99%

“…In addition, the superhydrophilic surface could provide cooling liquid to the heating area under the action of strong capillary forces, thereby improving boiling heat transfer [271,272]. Wang et al [272] fabricated a superhydrophilic macro/micro/nanostructured surface by combining hot embossing and hydrothermal treatment. The macro/micro/nanostructured surface was composed of macro groove arrays with a period of 1 mm (figure 26(f)), micro pyramid-channel arrays with a width of 100 µm and a height of 173 µm, and needle-shaped nanostructures with a length of several hundred nanometers.…”

Section: Heat Transfermentioning

confidence: 99%

Recent progress in bio-inspired macrostructure array materials with special wettability—from surface engineering to functional applications

Lian,

Zhou,

Ren

et al. 2023

Int. J. Extrem. Manuf.

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Bio-inspired macrostructure array (MAA, size: submillimeter to millimeter scale) materials with special wettability (MAAMs-SW) have attracted considerable attention due to their outstanding performance in many fields, such as oil repellency, liquid/droplet manipulation, anti-icing, heat transfer, water collection, and oil−water separation. In this review, we mainly focus on recent developments in the theory, design, fabrication, and application of bio-inspired MAAMs-SW. First, we briefly introduce the basic theory of special wettability. Afterwards, we discuss representative structures and corresponding functions of some biological surfaces. Then, we summarize fabrication methods of special wetting MAAs from the three categories of additive manufacturing, subtractive manufacturing, and formative manufacturing, including 3D printing, laser etching, wire electrical discharge machining, micro-mechanical cutting machining, electrochemical machining, template method, and imprinting method. In addition, we demonstrate the applications of these MAAMs-SW. Lastly, the challenges and directions of future research on bio-inspired MAAMs-SW are briefly addressed.

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“…It needs to be explained that the above criteria (Figures 4-6) can only be applied to ordinary rough surfaces. However, as shown in Figure 7, more and more complex surface structures are being used to enhance boiling heat transfer, such as metal foams [42], nanostructures [43], and porous media [44]. How to describe the disordered microstructure of these complex surfaces by mathematical logic is the urgent problem that still needs to be solved.…”

Section: Heterogeneous Nucleationmentioning

confidence: 99%

A Review of Pool-Boiling Processes Based on Bubble-Dynamics Parameters

Xiao,

Zhuang,

et al. 2023

Applied Sciences

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Immersion cooling is widely used for thermal management of servers. The two-phase immersion cooling, which transfers heat by boiling, possesses efficient temperature control ability under intensive heat generation. In the process of temperature control through boiling, the generation and transportation of bubbles play a crucial role in calculating the heat-transfer capacity. Therefore, it holds immense significance to obtain a profound understanding of the mechanisms underlying bubble formation and detachment. Currently, numerous mechanistic explanations and empirical correlations have been proposed to elucidate the various parameters of bubbles during the boiling process. These findings were considered to be valuable references when selecting appropriate boiling media and designing efficient heating surfaces. To comprehensively present the progress of bubble formation and heat transfer in the boiling system, the forces exerted on the bubbles are highlighted in this article. A meticulous review of bubble-force analysis and correlation formulae pertaining to various relevant parameters (e.g., nucleation sites density, bubble growth rate, bubble growth period, and detachment frequency) was conducted. This review article was also expected to provide a novel foundation for further exploration of enhanced boiling heat transfer.

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Achieving robust and enhanced pool boiling heat transfer using micro–nano multiscale structures

Cited by 19 publications

References 61 publications

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Recent progress in bio-inspired macrostructure array materials with special wettability—from surface engineering to functional applications

A Review of Pool-Boiling Processes Based on Bubble-Dynamics Parameters

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