Fabrication and performance evaluation of flexible heat pipes for potential thermal control of foldable electronics

Yang, Chao; Chang, Chao; Song, Chengyi; Shang, Wen; Wu, Jianbo; Tao, Peng; Deng, Tao

doi:10.1016/j.applthermaleng.2015.11.078

Cited by 54 publications

(20 citation statements)

References 29 publications

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“…Examples of hierarchically designed wicks (e.g., hierarchical silicon microstructure, zinc oxide nanowires, or copper posts) showed the potential to improve the capillary wicking by employing multiple length scales, but they cannot be applied to flexible applications. Previous porous wicks tested on curved surfaces consist of either porous metals that cannot return to their original state after deformation due to the structural rigidity or porous polymers that do not provide sufficient thermal conductivity (<1 W/(m·K)). , Therefore, the remaining challenge is to address the demands for the hierarchically designed, flexible porous metals that can still enable a capillary flow.…”

Section: Introductionmentioning

confidence: 99%

“…Previous porous wicks tested on curved surfaces consist of either porous metals that cannot return to their original state after deformation due to the structural rigidity or porous polymers that do not provide sufficient thermal conductivity (<1 W/(m•K)). 36,37 Therefore, the remaining challenge is to address the demands for the hierarchically designed, flexible porous metals that can still enable a capillary flow.…”

Section: ■ Introductionmentioning

confidence: 99%

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Capillary Wicking in Hierarchically Textured Copper Nanowire Arrays

Lee

Suh

Dubey

et al. 2018

ACS Appl. Mater. Interfaces

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Capillary wicking through homogeneous porous media remains challenging to simultaneously optimize due to the unique transport phenomena that occur at different length scales. This challenge may be overcome by introducing hierarchical porous media, which combine tailored morphologies across multiple length scales to design for the individual transport mechanisms. Here, we fabricate hierarchical nanowire arrays consisting of vertically aligned copper nanowires (∼100 to 1000 nm length scale) decorated with dense copper oxide nanostructures (∼10 to 100 nm length scale) to create unique property sets that include a large specific surface area, high rates of fluid delivery, and the structural flexibility of vertical arrays. These hierarchical nanowire arrays possess enhanced capillary wicking (K/R eff = 0.004–0.023 μm) by utilizing hemispreading and are advantageous as evaporation surfaces. With the advent and acceleration of flexible electronics technologies, we measure the capillary properties of our freestanding hierarchical nanowire arrays installed on curved surfaces and observe comparable fluid delivery to flat arrays, showing the difference of 10–20%. The degree of effective inter-nanowire pore and porosity is shown to govern the capillary performance parameters, thereby this study provides the design strategy for capillary wicking materials with unique and tailored combinations of thermofluidic properties.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Capillary Wicking in Hierarchically Textured Copper Nanowire Arrays

Lee

Suh

Dubey

et al. 2018

ACS Appl. Mater. Interfaces

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“…The precleaned copper foam possesses a smooth surface, and the water droplet (10 μL) forms a hemisphere on the surface. Figure b shows that after treatment with the alkali solution, the yellow-colored copper foam becomes black as the smooth copper surface has been oxidized into rough nanostructured surface of Cu(OH) 2 needles. , The formation of hydrophilic Cu(OH) 2 and increased surface roughness together makes the surface superhydrophilic. The water droplets thus are quickly absorbed by the surface.…”

Section: Resultsmentioning

confidence: 99%

Form-Stable Solar Thermal Heat Packs Prepared by Impregnating Phase-Changing Materials within Carbon-Coated Copper Foams

Tao

Chang

et al. 2018

ACS Appl. Mater. Interfaces

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The heat packs that are based on solid–liquid transition of phase-changing materials (PCMs) have been pursued as a promising way to provide heating for human body comfort and thermotherapy owning to their large heat storage capacity and near-constant heat-release temperature. Current heat packs, however, suffer from leakage, slow charging, and poor heat-release performance due to the flow of liquid PCMs and their low thermal conductivity. Here, we report a strategy for preparing high-performance PCM-based solar thermal heat packs through impregnating organic PCMs within carbon-coated copper foams (CCFs). The porous structure and hydrophobic surface of CCF help to effectively confine the melted liquid PCM within the composite heat pack without leakage. The carbon coating layer efficiently converts the incident solar light into heat, which is rapidly transferred along the three-dimensional thermal conductive network of CCF and stored within the PCM. In the discharging process, the CCF network facilitates the extraction of the heat stored within the PCM. In contrast to neat PCM pack within which only a small portion of PCM that is in contact with human skin contributes to thermal comfort, all PCMs within the CCF-based composite heat pack concertedly release the stored heat. Such release significantly increases the extractable thermal energy and prolongs the usable healing duration for thermotherapy.

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“…In 2015, Yang et al [14] did a fabrication and performance evaluation of flexible heat pipes for potential thermal control of foldable electronics. Author used a fluoro-rubber tube that acts as a connecting link between the evaporator and condenser sections.…”

Section: International Journal Of Engineering Research and Technology (mentioning

confidence: 99%

A Review of Performance of Heat Pipes at Different Inclinations

Singh¹,

Sharma²,

Gangacharyulu³

2017

IJERT

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Heat Pipe are the superconductors of heat because of their fantastic heat handling and transporting ability with minimum heat loss. A lot of research and experimentation has been carried out on heat pipes in the 21 st century due to modernization and miniaturization of equipments. This review aims to collect and compile research works by various authors in the field of heat pipe, where they have studied the performance of heat pipe under different tilt angles or inclinations. Gravitational and capillary forces play a very important role in deciding the overall performance of a heat pipe. At every different inclination, the resultant of these two forces varies, so the efficiency of a heat pipe also varies. This is the reason why there is a need to thoroughly study the performance of heat pipes at different inclinations.

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Fabrication and performance evaluation of flexible heat pipes for potential thermal control of foldable electronics

Cited by 54 publications

References 29 publications

Capillary Wicking in Hierarchically Textured Copper Nanowire Arrays

Capillary Wicking in Hierarchically Textured Copper Nanowire Arrays

Form-Stable Solar Thermal Heat Packs Prepared by Impregnating Phase-Changing Materials within Carbon-Coated Copper Foams

A Review of Performance of Heat Pipes at Different Inclinations

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