A critical review of pool and flow boiling heat transfer of dielectric fluids on enhanced surfaces

Leong, K.C.; Ho, Jin Yao; Wong, Kai-Juan

doi:10.1016/j.applthermaleng.2016.10.138

Cited by 147 publications

(26 citation statements)

References 147 publications

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“…However, a few studies are found for tubular surfaces that are used for refrigerant applications. Details on the enhanced boiling surfaces fabricated by these novel techniques can be found in the reviews by Shojaeian and Koşar [9], Leong et al [10], and Kim et al [43].…”

Section: Enhanced Surfacesmentioning

confidence: 99%

“…Passive techniques involve special surface geometries, fluid additives, or insert devices for enhancement. The common passive techniques include enhanced surface [8-10], nanofluids [11,12], displaced inserts [13-15], and swirl flow device [15, 16]. Active techniques require external power input, such as ultrasound [17], mechanical vibration [18,19], electrohydrodynamic (EHD) [20,21], and magnetic field [22].…”

Section: Introduction1mentioning

confidence: 99%

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Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Lin

Kedzierski

2019

International Journal of Heat and Mass Transfer

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Global warming mitigation efforts have stimulated investigations of a new generation of low-GWP refrigerants. Because some of the proposed low-GWP refrigerants have unfavorable characteristics (e.g., flammability and toxicity), a small refrigerant charge is desirable. Compact heat exchangers with enhanced surfaces facilitate small refrigerant charge by having a large heat exchanger surface area to heat exchanger volume ratio. This paper reviews the current state-of-the-art for pool boiling heat transfer of low-GWP refrigerants on enhanced surfaces. An overview for the enhanced surface manufacturing technique is given along with detailed reviews of the heat transfer measurements and predictions for many of the low-GWP refrigerants, including the hydrofluoroolefin (HFO) class, the hydrocarbon (HC) class, carbon dioxide (CO2), and ammonia (NH3). The overview of the predictive methods includes mechanistic models and correlations for pool boiling on enhanced surfaces. Based on the surveyed literature, existing shortfalls are identified and suggestions for future studies are proposed.

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Section: Enhanced Surfacesmentioning

confidence: 99%

Section: Introduction1mentioning

confidence: 99%

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Lin

Kedzierski

2019

International Journal of Heat and Mass Transfer

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“…The use of nanoparticles in pool boiling processes is gaining more and more attention as a means of enhancing the heat transfer coefficient (HTC) [3][4][5][6][7][8]. In some studies, unmodified bare surfaces are used to boil nanofluids [9][10][11][12]; whereas in others, surfaces previously modified with nanoparticles are used to boil a pure working fluid [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Nucleate pool boiling heat transfer of SES36 fluid on nanoporous surfaces obtained by electrophoretic deposition of Al2O3

Song

Davies

Wen

et al. 2018

Applied Thermal Engineering

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With the aim of enhancing pool boiling heat transfer coefficient (HTC), the nucleate boiling performance of nanoporous surfaces obtained by an electrophoretic deposition (EPD) method is evaluated in this paper, with SES36 as the boiling fluid. A pool boiling experimental apparatus and procedure are described. Three kinds of experiment have been performed: (i) smooth stainless steel (SS) surface with pure SES36, providing the baseline; (ii) smooth SS surface with boiling nanofluid consisting of 0.5, 1 and 2 wt% Al 2 O 3 suspended in SES36; (iii) nanoporous surfaces, of SS coated by EPD in procedures using 0.5, 1 and 2wt% concentrations of Al 2 O 3 , with pure SES36 as the boiling fluid. In (ii), the results show that the HTC of the smooth SS surface deteriorated with increasing concentration of Al 2 O 3 . In (iii), however, the HTC increased by approximately 6.2%, 30.5% and 76.9% for surfaces prepared with suspensions containing 0.5, 1 and 2 wt% Al 2 O 3 respectively under the heat flux of 90 kW/m 2 , compared with the baseline of the smooth surface in (i). The boiling behaviors are related to the modified surface micro-morphology due to the deposition of nanoparticles, as visualised by scanning electron microscopy (SEM). / 27The maximum active nucleation site density was about 2.6×10 5 sites/m 2 for the 2 wt% EPD surface under 94 kW/m 2 , which is 1.8 times of the smooth SS surface. The increased site density of the nanoporous surface obtained by EPD enhanced greatly the nucleate pool boiling. KeywordsNucleate pool boiling; heat transfer coefficient; nanoporous surfaces; electrophoretic deposition; active nucleation site density Highlights of the Paper Nucleate pool boiling of SES36 on nanoporous surfaces obtained by EPD is evaluated  Three kinds of experiment are performed to compare smooth and nanoporous surfaces  The HTC increases by 76.9% for a nanoporous surface at heat flux of 90 kW/m 2  The increased nucleation site density of the nanoporous surface enhances the HTC

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“…Surface modification is regarded as a flourish prospective heat transfer enhancement technology, and lots of researchers dedicated to elaborate the modified surface for better heat removal. Surface modified with porous coating, nanomaterial coating, particle deposition, and atmospheric pressure plasma are investigated, and indicating surface modification can significantly improve the heat transfer performance . On the basis of former study, with coolant direct‐contact immersion cooling, the substrate surface of solar cells will potentially face with corrosion after a long time immersing under high illuminations.…”

Section: Introductionmentioning

confidence: 99%

New insights for phase-change immersion cooling enhancement of solar cells under high concentration ratios

et al. 2017

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Summary To answer how surface corrosion affects the heat transfer performance of phase‐change immersion cooling solar cells, electrochemical etching was used for substrate surface treatment of simulated dense‐array solar cells in this paper. Morphology, roughness, and wettability of treated surfaces were characterized by scanning electron microscope, atomic force microscope, and spreading area, respectively. A self‐running cooling system was developed to investigate the effect of surface treatment on self‐running characteristics and heat transfer performance under different ethanol inlet temperatures and concentration ratios. The results show that the surface treated for 2 hours owns higher wettability because of the honeycomb‐like porous structure. Lower ethanol flowing velocity obtained under lower ethanol inlet temperature with treated samples. The maximum declined degree in the wall superheating of 21.1% and the maximum enhancement in the heat transfer coefficient of 33.3% are obtained for sample treated for 2 hours because of its higher wettability and porosity structure. The results show that electrochemical etching on substrate surface can improve the phase‐change immersion cooling performance of solar cells.

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A critical review of pool and flow boiling heat transfer of dielectric fluids on enhanced surfaces

Cited by 147 publications

References 147 publications

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Nucleate pool boiling heat transfer of SES36 fluid on nanoporous surfaces obtained by electrophoretic deposition of Al2O3

New insights for phase-change immersion cooling enhancement of solar cells under high concentration ratios

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