Nucleate boiling in graphene oxide colloids: Morphological change and critical heat flux enhancement

Kim, Ji Min; Kim, Ji Hoon; Park, Su Cheong; Kim, Moo Hwan; Ahn, Ho Seon

doi:10.1016/j.ijmultiphaseflow.2016.05.016

Cited by 31 publications

(11 citation statements)

References 49 publications

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Section: Introductionmentioning

confidence: 87%

“…In our previous study [12,13], pool boiling performance of GO colloidal suspension was reported; GO flakes formed a 2D laminate structure with well-aligned flakes, and its thickness had a close relationship with the CHF enhancement ratio. The GO laminate was postulated as a heat spreader to disperse locally overheated region, i.e., hot spot, whereby a modified CHF correlation was derived, based on the thermal activity analysis [13,14], as shown in Table 1. In this study, a new approach was tried; the GO laminate was postulated as a liquid supply channel whereby liquid inflow rate was derived into the CHF enhancement gain, based on energy balance, with sharing data of [12,13].…”

Section: Introductionmentioning

confidence: 87%

“…When GO and reduced GO colloidal suspensions were used as working fluids in the nucleate boiling, the graphene flakes were self-assembled along the liquid-vapor interface of bubbles. The arranged GO and reduced graphene oxide (RGO) flakes close to the heating surface were deposited on it, resulting in two-dimensional (2D) [12,13] and three-dimensional (3D) [10] graphene structures, respectively; the CHF was enhanced dramatically. However, these graphene-coated surfaces showed mostly poor wettability.…”

Section: Introductionmentioning

confidence: 99%

“…This indicated that the wettability analysis for CHF enhancement discussed above could not solely explain the CHF enhancement on graphene-coated surfaces. As such, other explanations have also been investigated, including Rayleigh-Taylor (RT) instability [8,9], liquid-saturated porous media [10], and thermal activity [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The GO laminate was postulated as a heat spreader to disperse locally overheated region, i.e., hot spot, whereby a modified CHF correlation was derived, based on the thermal activity analysis [13,14], as shown in Table 1. In this study, a new approach was tried; the GO laminate was postulated as a liquid supply channel whereby liquid inflow rate was derived into the CHF enhancement gain, based on energy balance, with sharing data of [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Nanocapillarity in Graphene Oxide Laminate and Its Effect on Critical Heat Flux

Kim

et al. 2017

Journal of Heat Transfer

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The nanocapillarity phenomenon involves ultralow frictional flow of water molecules through nanoscale channels, and here we study this using exceptionally large number of nanochannels within graphene oxide (GO) laminates. The nanoconfined water molecules in GO nanochannels form square lattice (as in the ice bilayer), which melts and jumps across the channels, similar to slip flow, with mean speed of the order of 1 m/s. This ease of liquid spreading in GO laminate is used to delay the critical heat flux (CHF) phenomenon in water pool boiling, by preventing formation/growth of dry spots. The water nanocapillarity speed is derived based on the measured water penetration flux, and the CHF enhancement (up to 140%) is demonstrated on a 1-μm-thick GO laminate. The GO laminate offers efficient surface modifications for increased transport efficiency (and safety margin) of pool boiling heat transfer systems.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanocapillarity in Graphene Oxide Laminate and Its Effect on Critical Heat Flux

Kim

et al. 2017

Journal of Heat Transfer

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Boiling Heat Transfer Enhancement by Self‐Assembled Graphene/Silver Hybrid Film for the Thermal Management of Concentrated Photovoltaics

2020

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Graphene nanosheets have attracted appreciable interest in heat transfer augmentation due to the unique deposition characteristics. The porous morphology of the graphene deposited on the heating surface via self‐assembly is reported to retard the transition boiling significantly. However, less attention has been paid to ameliorate the heat transfer coefficient (HTC) of graphene‐dispersed solutions. Herein, silver ions are introduced into graphene nanofluids to ameliorate its HTC. During boiling, graphene nanosheets and silver nanoparticles simultaneously deposit on the heating surface to form a well‐structured porous graphene/silver hybrid coating. The newly formed surface is characterized for surface morphology, wettability, and roughness. The new surface coating enhances the HTC by up to 109% and maintains the retarded critical heat flux of graphene‐only nanofluids. The application of the enhanced boiling heat transfer for the thermal management of concentrated photovoltaics is studied. It is demonstrated that enhanced boiling allows for cogeneration of electricity and heat from concentrated photovoltaics at approximately fourfold increased production rate while maintaining efficient, safe, and reliable operation.

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Enhancement of critical heat flux using spherical porous bodies in saturated pool boiling of nanofluid

Mori

Yokomatsu

Utaka

2018

Applied Thermal Engineering

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Quenching of a stainless-steel rod with a porous ceramic structure, i.e. honeycomb porous plate (HPP), attached to its lower surface was investigated in distilled water under saturated conditions at atmospheric pressure. The experiments were performed on bare surface (BS) and on a TiO2 nanoparticle-deposited surface (NPDS). When the HPP was attached, the quenching rate increased significantly on both tested surfaces. The quench time for the NPDS with the HPP it was 28-times shorter than that for the bare stainless-steel surface. The results suggested that the combination of the HPP ability to transport water to the heat-transfer surface by capillary action, and the increase of surface roughness, capillarity and wettability properties by the deposited nanoparticle layer were responsible for the enhancement obtained.

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Nucleate boiling in graphene oxide colloids: Morphological change and critical heat flux enhancement

Cited by 31 publications

References 49 publications

Nanocapillarity in Graphene Oxide Laminate and Its Effect on Critical Heat Flux

Nanocapillarity in Graphene Oxide Laminate and Its Effect on Critical Heat Flux

Boiling Heat Transfer Enhancement by Self‐Assembled Graphene/Silver Hybrid Film for the Thermal Management of Concentrated Photovoltaics

Enhancement of critical heat flux using spherical porous bodies in saturated pool boiling of nanofluid

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