Electrophoretic deposition surfaces to enhance HFE-7200 pool boiling heat transfer and critical heat flux

Cao, Zhenggang; Wu, Zan; Pham, Anh Duc; Sundén, Bengt

doi:10.1016/j.ijthermalsci.2019.106107

Cited by 24 publications

(7 citation statements)

References 50 publications

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“…Their results showed that a heat flux of 80 kW/m 2 is attainable at a wall superheat about 27 • C for R a = 9 µm (a rough machining surface). Similarly, Cao et al [23,24] presented the influence of nanoparticle coating on nucleate pool boiling with HFE-7200, and their result showed that a heat flux of 80 kW/m 2 is attainable at a wall superheat about 13.5-15 • C. On the other hand, as can be depicted in Figure 4, either sample A or sample B offered the same heat flux at just about 10 • C wall superheat. Apparently, this is associated with the porous nature of the high-flux surface, which incorporated more nucleation sites onto the surfaces.…”

Section: Resultsmentioning

confidence: 88%

“…Recently, Cao et al [23,24] studied the pool boiling of HFE-7200 with nanoparticle (Cu-Zn ~100 nm) coating (e.g., modulated nanoparticle coating and uniform nanoparticle coating) and they observed that modulated surface could enhance the HTC and the critical heat flux by 60% and 20%-40%, respectively, in comparison to the smooth surface, while the uniform coating surface can improve HTC by a maximum 100% but shows no augmentation in the critical heat fluxes.…”

Section: Introductionmentioning

confidence: 99%

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Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200

2020

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In the present experimental study, nucleate pool boiling heat transfer measurements of two high-flux tubes (sample A and sample B) were conducted at atmospheric pressure with HFE-7200 as the working fluid. Both high-flux tubes were made from a sintered Cu-Ni (high-flux) alloy powder. The porous high-flux surface was coated inside the test tube and it is tested within the heat flux ranging from 2.6 to 86 kW/m2. The major difference between sample A and sample B was the coating thickness, where sample B (0.6 mm) was much larger than that of sample A (0.07 mm). Both tubes showed about three times enhancement in heat transfer coefficient (HTC) when compared to plain tube. Even though sample B contained a higher HTC than sample A, it also revealed a faster level-off phenomenon regarding the HTC vs. wall superheat. The major parameter which characterizes the boiling performance of high-flux tube was the ratio of coating thickness to pore diameter which also yielded different trends upon HTC vs. wall superheat amid sample A and B. It was found that the porous based Nishikawa correlation can well predict the performance of sample A but not sample B. This is because the ratio of coating thickness to pore diameter is far outside the applicable range of the Nishikawa correlation. Hence, a modified Nishikawa correlation is proposed. The predicted capability of the proposed modified Nishikawa correlation against sample A and sample for HTC was within ±28% deviation. The standard mean deviation of the Nishikawa correlation with experimental data for sample A and sample B was 0.302 (12.48%) and 5.64 (73%), respectively.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200

2020

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“…In addition, a wet/dry etching technique was used to fabricate micro pin fins, 40 − 44 micro cavities, 45 and nanowires, 46 − 48 while a new emerging laser technique was also attempted to modify the boiling surfaces, obtaining micro pin fins 49 − 51 and micro cavities. 52 Pool boiling of various liquids was experimentally investigated on the surfaces mentioned above, including SES36, 37 HFE-7200, 38 , 39 FC-72, 41 , 43 , 49 , 50 n-pentane, 51 and water, and on other surfaces. It was found that the boiling performance was considerably enhanced, but micro/nanocomposite structures generally were more favorable than sole micro- or nanostructures concerning the heat transfer coefficient or the critical heat flux.…”

Section: Introductionmentioning

confidence: 99%

“…The electrochemical (electroplating) deposition was also widely employed to generate microporous coatings on which pool boiling of FC-72, , Novec-649, HFE-7200, and water − was studied. Other coating technologies involve atomic layer deposition, − oxidation, , chemical vapor deposition, ,− electrophoretic deposition, − etc. In addition, a wet/dry etching technique was used to fabricate micro pin fins, − micro cavities, and nanowires, − while a new emerging laser technique was also attempted to modify the boiling surfaces, obtaining micro pin fins − and micro cavities .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a wet/dry etching technique was used to fabricate micro pin fins, − micro cavities, and nanowires, − while a new emerging laser technique was also attempted to modify the boiling surfaces, obtaining micro pin fins − and micro cavities . Pool boiling of various liquids was experimentally investigated on the surfaces mentioned above, including SES36, HFE-7200, , FC-72, ,,, n-pentane, and water, and on other surfaces. It was found that the boiling performance was considerably enhanced, but micro/nanocomposite structures generally were more favorable than sole micro- or nanostructures concerning the heat transfer coefficient or the critical heat flux. ,, In terms of the enhancement mechanisms, heat transfer enhancement was usually attributed to several aspects, e.g., the increase in active nucleation site density, effective bubble dynamics, and enlarged heat transfer area, but the mechanisms of critical heat flux enhancement varied in various studies, e.g., liquid–vapor competition inside structures, wicking intensification, ,,, and liquid–vapor hydrodynamic instability .…”

Section: Introductionmentioning

confidence: 99%

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Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces

et al. 2021

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Boiling heat transfer intensification is of significant relevance to energy conversion and various cooling processes. This study aimed to enhance the saturated pool boiling of FC-72 (a dielectric liquid) by surface modifications and explore mechanisms of the enhancement. Specifically, circular and square micro pin fins were fabricated on silicon surfaces by dry etching and then copper nanoparticles were deposited on the micro-pin-fin surfaces by electrostatic deposition. Experimental results indicated that compared with a smooth surface, the micro pin fins increased the heat transfer coefficient and the critical heat flux by more than 200 and 65–83%, respectively, which were further enhanced by the nanoparticles up to 24% and more than 20%, respectively. Correspondingly, the enhancement mechanism was carefully explored by high-speed bubble visualizations, surface wickability measurements, and model analysis. It was quantitatively found that small bubble departure diameters with high bubble departure frequencies promoted high heat transfer coefficients. The wickability, which characterizes the ability of a liquid to rewet a surface, played an important role in determining the critical heat flux, but further analyses indicated that evaporation beneath bubbles was also essential and competition between the wicking and the evaporation finally triggered the critical heat flux.

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Experimental investigations on the thermal performance of ultrasonic field in pool boiling on rib surfaces

Liu,

Hu,

Liu

et al. 2023

Heat Mass Transfer

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Electrophoretic deposition surfaces to enhance HFE-7200 pool boiling heat transfer and critical heat flux

Cited by 24 publications

References 50 publications

Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200

Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200

Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces

Experimental investigations on the thermal performance of ultrasonic field in pool boiling on rib surfaces

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