Performance enhancement of graphene-coated micro heat pipes for light-emitting diode cooling

Gan, Jie Sheng; Yu, Hao; Tan, Ming K.; Soh, Ai Kah; Wu, Heng An; Hung, Yew Mun

doi:10.1016/j.ijheatmasstransfer.2020.119687

Cited by 40 publications

(15 citation statements)

References 59 publications

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“…The single-layer honey-lattice arrangement of graphene and its derivatives allows remarkable physical and thermal properties [ 1 , 2 , 3 , 4 ]. Due to its high thermal conductivity, graphene and its derivatives manifest as excellent heat-conducting materials for electronics cooling applications [ 5 , 6 , 7 , 8 , 9 , 10 ]. However, there is a limitation to the thermal conductivity of graphene derivatives in these practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…While graphene nanostructures increase the heat-transfer surface area significantly, a larger nucleation site density, increased bubble frequency and smaller bubble diameter can be obtained. This ultrafast water transport property of graphene serves a dual purpose: enhancing the circulation rate of water via a nanocapillary effect and inducing the film-wise evaporation due to the formation of ultrathin water film [ 7 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Remarkable Thermal Performance Enhancement of Micro Heat Pipes with Graphene-Nanoplatelet Nano-Wicks

Gan¹,

Hung²

2023

Nanomaterials

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The ultrafast water permeation property of graphene nanoplatelets (GNPs) synergically enhances the evaporation and water circulation processes in a micro heat pipe (MHP). An MHP is a promising phase-change heat-transfer device capable of transferring large amounts of heat energy efficiently. The hydrophobic, atomically smooth carbon walls of GNPs nanostructures provide a network of nanocapillaries that allows water molecules to intercalate frictionlessly among the graphene layers. Together with the attraction force of the oxygenated functional groups, a series of hydrophobic and hydrophilic surfaces are formed that significantly improve the water circulation rate. The intercalation of water molecules encourages the formation of water-thin film for film-wise evaporation. The effect of nano-wick thickness on the thermal performance of the MHP is investigated. A thinner GNP nano-wick is more favorable to film-wise evaporation while a thicker nano-wick promotes a higher water circulation rate from the condenser to the evaporator, leading to the existence of an optimal thickness. By benchmarking with the uncoated MHP, the thermal conductance of an MHP with a 46.9-µm GNP nano-wick manifests a maximum enhancement of 128%. This study provides insights on the feasible implementation of GNP nano-wicks into a highly efficient micro-scale electronics cooling device for environmental sustainability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Remarkable Thermal Performance Enhancement of Micro Heat Pipes with Graphene-Nanoplatelet Nano-Wicks

Gan¹,

Hung²

2023

Nanomaterials

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“…The graphene microchannel with superior high-temperature stability [1] , outstanding mechanical properties [2] , and rapid heat transfer [3] has inspired massive interest in the thermal engineering fields of electronic devices and thermoelectric devices [4][5][6][7][8][9][10][11][12][13][14][15][16][17] . Understanding and predicting interfacial thermal resistance between graphene layers and nanofluids is essential to further the advance of these graphene-based nanoscale devices.…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on thermal transport at the graphene-liquid interface

Chen¹,

Yang²,

Qiao³

et al. 2022

Eng. Sci.

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The mechanism of thermal resistance between graphene layers and nanofluids is essentially important to the performance and reliability of the graphene microchannels. In this paper, the interfacial thermal resistance of the graphenewater, graphene-ethanol, and graphene-ethylene glycol systems are systematically investigated using non-equilibrium molecular dynamics simulations (NEMD). The results showed that the interfacial thermal resistance of the three structures showed different trends as the temperature increased. The interfacial thermal resistance of the graphene-water, the graphene-ethanol, and the graphene-glycol system achieve a minimum value at 285 K, 165 K, and 335 K, respectively. The effects of graphene width on graphene-water interfacial thermal resistance are greater than that of graphene-ethanol and graphene-ethylene glycol systems, however, the thickness of the liquid cluster has greater effect on the interfacial thermal resistance for the graphene-ethanol and graphene-ethylene glycol interfaces than that of graphene-water system. The near-wall density analysis and phonon density of states analysis are calculated to explain the validity of our NEMD simulation results. Our study is helpful for improving the efficiency of the graphene microchannels.

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“…Some researchers have considered the thermophysical properties and forced convective heat transfer performance of graphene [ 36 , 37 ] and reviewed the applications of graphene [ 38 , 39 ]. Researchers have suggested that the conductivity of water can be improved through the addition of mono and hybrid nano-additives containing graphene and silica [ 40 ] and have developed a method that integrates graphene nanocapillaries into a micro heat pipe for enhanced LED cooling [ 41 ]. Graphene solutions have been widely applied to increase heat transfer efficiency [ 42 , 43 , 44 , 45 , 46 , 47 ], and a higher graphene solution concentration has been demonstrated to result in greater heat transfer [ 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Temperature and Optical Power of an LED by Using Microfluidic Circulating System of Graphene Solution

Chung

Lin

2021

Nanomaterials

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Electric devices have evolved to become smaller, more multifunctional, and increasingly integrated. When the total volume of a device is reduced, insufficient heat dissipation may result in device failure. A microfluidic channel with a graphene solution may replace solid conductors for simultaneously supplying energy and dissipating heat in a light emitting diode (LED). In this study, an automated recycling system using a graphene solution was designed that reduces the necessity of manual operation. The optical power and temperature of an LED using this system was measured for an extended period and compared with the performance of a solid conductor. The temperature difference of the LED bottom using the solid and liquid conductors reached 25 °C. The optical power of the LED using the liquid conductor was higher than that of the solid conductor after 120 min of LED operation. When the flow rate was increased, the temperature difference of the LED bottom between initial and 480 min was lower, and the optical power of the LED was higher. This result was attributable to the higher temperature of the LED with the solid conductor. Moreover, the optical/electric power transfer rate of the liquid conductor was higher than that of the solid conductor after 120 min of LED operation, and the difference increased over time.

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Performance enhancement of graphene-coated micro heat pipes for light-emitting diode cooling

Cited by 40 publications

References 59 publications

Remarkable Thermal Performance Enhancement of Micro Heat Pipes with Graphene-Nanoplatelet Nano-Wicks

Remarkable Thermal Performance Enhancement of Micro Heat Pipes with Graphene-Nanoplatelet Nano-Wicks

Temperature effects on thermal transport at the graphene-liquid interface

Improvement of Temperature and Optical Power of an LED by Using Microfluidic Circulating System of Graphene Solution

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