WEDM one-step preparation of miniature heat sink with superhydrophobic and efficient heat transfer performance

Li, Zhaolong; Li, Wangwang; Meng, Xianhong; Yuan, Mengchen

doi:10.1007/s00170-023-11679-5

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…Improving heat transfer efficiency holds great significance for energy conservation and environmental protection. Dropwise condensation, known for its high heat transfer efficiency, has emerged as an attractive heat transfer method, with dropwise condensation on superhydrophobic surfaces gaining significant research attention [184,[267][268][269][270]. Droplets will show different states during condensation, and significantly different heat transfer effects on superhydrophobic surfaces with different structures and morphologies.…”

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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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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“…If the liquid directly contacts the concave convex surface of the solid surface microstructure, the droplet is in a Wenzel state [26]. And if the liquid is only in contact with the convex surface of the microstructure, this droplet is in Cassie state [27]. Xu et al has reported that under the combined action of an external electric field and a neutral electrolyte during surface textured by electrochemical machining [28], the inherent grain boundaries/dislocations on the workpiece surface are preferentially etched away, and the micro textured surface is uniformly distributed with sub-micron or nanoscale pits and convex structures.…”

Section: Analytical Model For Determining Camentioning

confidence: 99%

Investigation of micro pit array on titanium alloy with hydrophobic surface by through-mask electrochemical micromachining

Meng

Zhang

et al. 2023

Surf. Topogr.: Metrol. Prop.

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TIn order to obtain higher contact angles and improve the hydrophobicity of titanium alloy, the micro pit arrays were fabricated by the through-mask electrochemical micromachining (TMEMM). The theoretical model of surface hydrophobicity between the contact angle and the geometry size of micro pit arrays was developed. Moreover, the multi physical field coupling simulation of TMEMM was carried out. Thus, the direct mapping relationship between the contact angle and the process parameters was obtained by combining the theoretical model with the simulation results. The effect of process prameters, such as electrolyte mass fraction, mask size and processing voltage, was investigated. The optimal combination of process parameters was predicted and verified by experiments. The results show that the errors of the measured values of diameter, spacing, depth and surface contact angle of the micro pit arrays are 2.49%, 6.87%, 7.40% and 6.01% respectively, which indicates that the hydrophobic textured surface with a contact angle of about 141° is successfully fabricated without the modification of low surface energy materials.

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“…Surface topography can be achieved through various methods, such as wire Electric Discharge Machining [14][15][16][17][18], laser machining [14,19,20], photolithography [4,21] etc. Cao et al [14] and Wang et al [22] used wire EDM in order to introduce grooves on aluminum alloy and titanium alloy, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Superhydrophilic surfaces promote filmwise condensation, resulting in the formation of a water film on the surface as condensation proceeds. This liquid film introduces an additional thermal resistance layer and reduces the condenser's efficiency [18] by creating an unwanted thermal barrier on the metal surface. In contrast, DwC has proven to be highly efficient for heat transfer especially when accompanied with high condensate removal, yielding heat transfer coefficients significantly higher than those measured during FwC [25,27,28].…”

Section: Introductionmentioning

confidence: 99%

Inducing hydrophobicity in Stainless Steel 304 by mechanical texturing and chemical functionalization

Nanou,

Zarkadoulas,

Pandis

et al. 2024

Preprint

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This study investigates the impact of combined texturing by micromachining and chemical functionalization on the wetting behavior and water condensation of a metallic surface. The transition from the Wenzel to Cassie-Baxter or impregnated Cassie-Baxter regimes was unveiled. Initially, grooved stainless steel 304 specimens displayed hydrophobic wetting in the Wenzel mode. The chemical functionalization with silane triggered a remarkable shift that was not observed in non-textured by micromachining samples. Thus contact angles surged, facilitating a transition to the Cassie-Baxter state for directional canal specimens and the impregnated Cassie-Baxter state for those with pyramidal patterns. Roll-off angle experiments showcased distinct behavior among specimens featuring canals or pyramidal structures. Specimens with canals exhibited notably lower roll-off angles compared to both flat surfaces and those with pyramidal patterns. Notably, the orientation of canals influenced these angles, with vertically aligned canals demonstrating reduced roll-off angles. In humid environments, micro-machined surfaces exhibited superior water condensation capabilities compared to untreated flat SS304 surfaces. Remarkably, chemically functionalized grooved specimens presented larger condensate droplet diameters than flat surfaces. Consequently a remarkable enhancement in water condensation and a 7 fold higher latent heat transfer coefficient is reported.

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WEDM one-step preparation of miniature heat sink with superhydrophobic and efficient heat transfer performance

Cited by 10 publications

References 29 publications

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

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

Investigation of micro pit array on titanium alloy with hydrophobic surface by through-mask electrochemical micromachining

Inducing hydrophobicity in Stainless Steel 304 by mechanical texturing and chemical functionalization

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