Enhancing thermal stability and uniformity in boiling heat transfer using micro-nano hybrid surfaces (MNHS)

Lee, Donghwi; Lee, Namkyu; Shim, Dong Il; Kim, Beom-Seok; Cho, Hyung Hee

doi:10.1016/j.applthermaleng.2017.10.144

Cited by 53 publications

(5 citation statements)

References 50 publications

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“…This phenomenon is attributed to the predominant bubble generation occurring primarily on the tops of micro-pin-fins, thereby mitigating the blockage of the capillary wicking channels by the bubbles in the high heat flux region. Lee et al [ 38 ] investigated pool boiling performance utilizing deionized water on structured silicon surfaces under saturated conditions. Their results revealed that surfaces featuring a hybrid micro-nanostructure exhibited the highest CHF, reaching up to 2600 kW m −2 .…”

Section: Introductionmentioning

confidence: 99%

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Hadžić,

Može,

Zupančič

et al. 2024

Nanomaterials

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The rapid progress of electronic devices has necessitated efficient heat dissipation within boiling cooling systems, underscoring the need for improvements in boiling heat transfer coefficient (HTC) and critical heat flux (CHF). While different approaches for micropillar fabrication on copper or silicon substrates have been developed and have shown significant boiling performance improvements, such enhancement approaches on aluminum surfaces are not broadly investigated, despite their industrial applicability. This study introduces a scalable approach to engineering hierarchical micro-nano structures on aluminum surfaces, aiming to simultaneously increase HTC and CHF. One set of samples was produced using a combination of nanosecond laser texturing and chemical etching in hydrochloric acid, while another set underwent an additional laser texturing step. Three distinct micropillar patterns were tested under saturated pool boiling conditions using water at atmospheric pressure. Our findings reveal that microcavities created atop pillars successfully facilitate nucleation and micropillars representing nucleation site areas on a microscale, leading to an enhanced HTC up to 242 kW m−2 K−1. At the same time, the combination of the surrounding hydrophilic porous area enables increased wicking and pillar patterning, defining the vapor–liquid pathways on a macroscale, which leads to an increase in CHF of up to 2609 kW m−2.

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Section: Introductionmentioning

confidence: 99%

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Hadžić,

Može,

Zupančič

et al. 2024

Nanomaterials

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“…17–22 A common research thrust is to utilize hydrophilic, micro/nano hierarchically enhanced surfaces with two or even multiple length scales. 23–28 These multi-tier-roughness surfaces achieve some of the highest reported boiling performances, which is attributed to the activation of more nucleation sites, effective evaporative surface area increase, and capillary-assisted surface rewetting enhancement. 1,25,27,29,30 Another effective approach recently receiving attention is the use of surfaces with opposing wettability.…”

Section: Introductionmentioning

confidence: 99%

“…23–28 These multi-tier-roughness surfaces achieve some of the highest reported boiling performances, which is attributed to the activation of more nucleation sites, effective evaporative surface area increase, and capillary-assisted surface rewetting enhancement. 1,25,27,29,30 Another effective approach recently receiving attention is the use of surfaces with opposing wettability. 15,23,31–35 This method capitalizes on the juxtaposition of high and low activation energies to promote bubble nucleation on designated spots while continuously replenishing the rest of the surface with liquid.…”

Section: Introductionmentioning

confidence: 99%

Computer vision-assisted investigation of boiling heat transfer on segmented nanowires with vertical wettability

Lee¹,

Suh

Kuciej

et al. 2022

Nanoscale

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“…Ferjančič and Golobič [17] also demonstrated that surface roughness had a positive effect on pool boiling CHF for both FC-72 and water and the influence of boiling surface chemistry should also be considered. Shin et al [18,19] prepared a rough micronano hybrid surface by the electrodeposition method and pointed out that the combined effects of nanowire and microcavity delayed bubble coalescence and maximized bubble density, resulting in the enhancement of pool boiling CHF. Chu et al [20] investigated the effect of roughness-augmented wettability on CHF and indicated that roughness-amplified capillary forces were responsible for CHF enhancement on microstructured pillar surfaces.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Study on the Influence of Saturation Pressure and Surface Roughness on Pool Boiling CHF of HFE-7100

Fan

Lei

et al. 2022

International Journal of Chemical Engineering

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Critical heat flux (CHF) determines the safety and application of pool boiling heat transfer in many industrial fields. The influence of saturation pressure and surface roughness on saturated pool boiling CHF in hydrofluoroether HFE-7100 was experimentally studied in this investigation. Visualization and heat transfer measurements were conducted at the critical and transition boiling state, and further, the accuracy of CHF prediction models and enhancement mechanism had been analyzed. The polished boiling surfaces had various surface roughness values ranging from 0.019 to 0.587 μm and their contact angles varied from 7° to 10°, while the experimental saturation pressure changed from 0.7 to 2.0 bar. The visual images showed that the pool boiling phenomenon at a critical state was composed of different-sized bubbles, vapor column, and large mushroom vapor, whereas the unsteady blanket of vapor continually injected bubbles at a transition state. The saturation pressure and surface roughness had an obvious improvement on pool boiling CHF, which might be ascribed to the effects of bubble momentum owing to evaporation, distribution and recovery period of a heat transfer boundary layer, capillary action of the working liquid, as well as ratio of vapor jets’ area. Compared with the well-known correlations reported in the literature, CHF correlation of Bailey et al. (2006) predicted the current results more accurately. To further improve the prediction accuracy, a new empirical correlation for CHF dimensionless K considering the effects of saturation pressure and surface roughness was developed, and the predicted values were in better agreement with the experimental data.

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Enhancing thermal stability and uniformity in boiling heat transfer using micro-nano hybrid surfaces (MNHS)

Cited by 53 publications

References 50 publications

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Aluminum Micropillar Surfaces with Hierarchical Micro- and Nanoscale Features for Enhancement of Boiling Heat Transfer Coefficient and Critical Heat Flux

Computer vision-assisted investigation of boiling heat transfer on segmented nanowires with vertical wettability

Experimental and Analytical Study on the Influence of Saturation Pressure and Surface Roughness on Pool Boiling CHF of HFE-7100

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