Nanoengineered materials for liquid–vapour phase-change heat transfer

Cho, H. Jeremy; Preston, Daniel J.; Zhu, Yangying; Wang, Evelyn N.

doi:10.1038/natrevmats.2016.92

Cited by 501 publications

(342 citation statements)

References 170 publications

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“…On the contrary, some crystallization phenomena also bring negative effects on our daily life and industrial production such as the calcification of joints, gouts, and kidney stones as well as water scales . Because the underlying mechanism for scale problems also roots in crystallization, it is absolutely necessary to understand the crystallization behavior of inorganic salts on the surfaces, such as CaCO 3 , calcium sulfate (CaSO 4 ), and calcium phosphate (Ca 3 (PO 4 ) 2 ), greatly depending on the practical scenarios (e.g., thermal desalination and petroleum industry) . Generally, scale formation on these heat transfer surfaces can be classified into two different modes: “deposition mode” and “adhesion mode” ( Figure ) .…”

Section: The Mechanism Of Scale Formationmentioning

confidence: 99%

Advanced Antiscaling Interfacial Materials toward Highly Efficient Heat Energy Transfer

Meng

Wang

2019

Adv Funct Materials

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The energy problem has been a matter of some concern worldwide over the past 20 years. On the opposite side of energy production, energy loss is another crucial problem of current energy due to the low efficiency of heat transfer from scale deposition. However, less attention has been paid on the further development of advanced antiscaling interfacial materials, which may provide promising ways to save energy by reducing scale fouling. Herein, the development of antiscaling strategies is summarized from the basic theories and fabrication methods to antiscaling interfacial materials with potential applications. First, the mechanism of scale formation and the corresponding effect on thermal conductivity are introduced. Second, the typical fabrication approaches of antiscaling interfacial materials are briefly described. Finally, the performance, potential applications, future challenges, and opportunities of the advanced antiscaling interfacial materials are comprehensively discussed.

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Section: The Mechanism Of Scale Formationmentioning

confidence: 99%

Advanced Antiscaling Interfacial Materials toward Highly Efficient Heat Energy Transfer

Meng

Wang

2019

Adv Funct Materials

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“…[30,[95][96][97][98][99][100] Condensation has two basic modes: filmwise condensation in the case of hydrophilic surfaces, where the condensate exists in the form of a continuous liquid film, and dropwise condensation in the case of hydrophobic surfaces, which is characterized by the dynamic self-renewal of discrete drops. [99] It has been reported that dropwise condensation results in more efficient energy transport, allowing a heat-transfer coefficient that is 5-7 times higher than that of filmwise condensation, since discrete drops have relatively lower thermal resistance than continuous liquid films and can release a larger number of bare sites for nucleation and thermal energy transport.…”

Section: Enhanced Heat Transfermentioning

confidence: 99%

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

2017

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interest has focused on utilizing the lowadhesivity nature of superhydrophobic surfaces for the rapid removal of condensate microdrops, as this has significance in fundamental research and technological innovation. Example applications are the enhancement of condensation heat transfer for high-efficiency thermal management and energy utilization, [20][21][22][23][24][25] energy-effective antifreezing for airconditioner heat exchangers and aircraft wings, [26][27][28] and electrostatic energy harvesting. [29] In general, condensate drops on typical flat hydrophobic surfaces are only shed off under gravity when their sizes are comparable to the capillary length (≈2.7 mm for water), [30] which creates undesirable effects such as large thermal resistance [20][21][22][23][24][25] and the freezing of subcooled drops. [26][27][28] Clearly, a great challenge is the timely removal of condensate drops at the microscale where the gravitational effect does not work. The latest research has indicated that these small-scale condensate microdrops may self-remove via mutual coalescence as long as the coalescence-released excess surface energy is larger than the interface adhesion-induced energy dissipation. [31] Much effort has been devoted to exploring the utilization of knowledge of bionic low-adhesivity superhydrophobicity to develop innovative condensate microdrop self-propelling (CMDSP) surfaces. Different from traditional superhydrophobic surfaces, which are characterized by the bouncing or rolling off of deposited millimeter-size large drops, [32,33] CMDSP surfaces support the self-removal capability of smallscale condensate microdrops. It has been reported that classical superhydrophobic lotus leaves (Figure 1a), [34][35][36][37] as well as artificial surfaces consisting of hierarchical micro-and nanostructures, [38] one-tier microstructures, [39][40][41][42][43] or nanostructures [44,45] with larger characteristic interspaces, present a low-adhesivity property to the deposited water macrodrops, but become highly adhesive to condensed microdrops (Figure 1b). This is because moisture easily penetrates the microscale valleys or cavities. Clearly, superhydrophobic surfaces with irrationally designed surface structures can enhance the solid-liquid interfacial adhesion instead of promoting the rapid removal of condensed drops. Accordingly, it is still a challenge to design and fabricate very effective low-adhesivity superhydrophobic surfaces with the self-removal ability of condensate microdrops. Recently, there has been a large breakthrough in understanding the mechanism and construction rules of bionic CMDSP surfaces, leading to the exploration of fabrication methods for the surface functionalization of widely used metal materials and the Bionic condensate microdrop self-propelling (CMDSP) surfaces are attracting increased attention as novel, low-adhesivity superhydrophobic surfaces due to their value in fundamental research and technological innovation, e.g., for enhancing heat transfer, energy-effective antifreezing, and...

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“…[60,67,68] This will result in a controllable liquid flow on the surface, showing wide applications in mechanical engineering, including in controllable self-lubrication (Figure 4c), and heat or mass transfer. [69] In addition, one of the important applications of peristome-mimetic structures could be in microfluidics, [70] and the unidirectional liquid transport on the biomimetic structure in channels could be used for smart and controllable microfluidic devices (Figure 4d), for example, the lab-on-a-chip. The developed preparation and control method have constructed the platform for further research in applications, and its huge potential should be delivered in the near future.…”

Section: Applications Of Peristome-inspired Surfacesmentioning

confidence: 99%

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

et al. 2017

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The slippery peristome of the pitcher plant Nepenthes has attracted much attention due to its unique function for preying on insects. Recent findings on the peristome surface of Nepenthes alata demonstrate a fast and continuous unidirectional liquid transport, which is enabled by the combination of a pinning effect at the sharp edges and a capillary rise in the wedge, deriving from the multiscale structure, which provides inspiration for designing and fabricating functional surfaces for unidirectional liquid transport. Developments in the fabrication methods of peristome‐inspired surfaces and control methods for liquid transport are summarized. Both potential applications in the fields of microfluidic devices, biomedicine, and mechanical engineering and directions for further research in the future are discussed.

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Nanoengineered materials for liquid–vapour phase-change heat transfer

Cited by 501 publications

References 170 publications

Advanced Antiscaling Interfacial Materials toward Highly Efficient Heat Energy Transfer

Advanced Antiscaling Interfacial Materials toward Highly Efficient Heat Energy Transfer

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

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