Pool boiling heat transfer of N-pentane on micro/nanostructured surfaces

Liu, Bin; Cao, Zhenggang; Zhang, Yonghai; Wu, Zan; Pham, Anh Duc; Wang, Wenjun; Yan, Zhaoxuan; Wei, Jinjia; Sundén, Bengt

doi:10.1016/j.ijthermalsci.2018.05.012

Cited by 39 publications

(11 citation statements)

References 37 publications

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“…The heat transfer of plain surfaces was improved in some studies when nanostructures were added to the pool boiling of refrigerants [18] and Fluorinerts [19][20][21], and the flow boiling of Fluorinerts [22], with authors attributing this to increased nucleation site density caused by the particular nanocoatings used. In some cases, the nanostructures only improved the heat transfer at higher heat fluxes, while at lower heat fluxes, the plain surfaces were comparable or better than the nanostructured surface [12,23].…”

Section: Introductionmentioning

confidence: 99%

“…The critical heat flux (CHF) of a surface was generally shown to increase with the presence of nanostructures compared with plain surfaces when boiling water [4,5]. This improved CHF performance was attributed to mechanisms such as improved wettability of the surfaces [6], increased contact line length of the bubble due to increased roughness [9] and improved wickability of the surfaces [10][11][12], all delaying the creation of a vapour blanket. Given the wide ranges of nanostructured surfaces produced, it is possible that the relevance of these mechanisms varies for each type of surface.…”

Section: Introductionmentioning

confidence: 99%

“…providing liquid replenishment to nucleation sites. Liu et al [12] found that the CHF stayed the same in the pool boiling of n-pentane on a nanoparticle-coated surface, while the CHF improved for combined nano-microstructured surfaces. High-speed videos showed that the nanoparticle-coated and plain surfaces had similar droplet-spreading abilities, while the nano-microstructured surfaces showed improved droplet spreading.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pool boiling of refrigerants over nanostructured and roughened tubes

Bock

Bucci

Markides

et al. 2020

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pool boiling of refrigerants over nanostructured and roughened tubes

Bock

Bucci

Markides

et al. 2020

International Journal of Heat and Mass Transfer

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“…Again, heat transfer improvement for pool boiling of FC‐72 around a mixed‐wettability surface was investigated by Kong et al 29 The results revealed that the mixed‐wettability surface showed adequate nucleation sites and enhanced bubble interaction. Liu et al 30 studied pool‐boiling heat transfer for N ‐pentane around a microstructured or nanostructured surface and observed that the heat transfer coefficient of all micro/nanostructured surfaces increased with the decrease of CHF. Again Liu et al 31 experimentally investigated the pool‐boiling heat transfer of dissolved FC‐72 gas on a structured surface by using the Hook‐Back phenomenon.…”

Section: Experimental Studiesmentioning

confidence: 99%

Improvement of heat transfer through fins: A brief review of recent developments

Maji¹,

Choubey

2020

Heat Trans

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Fins or extended surfaces are generally used in heat exchangers to enhance heat transfer between the main surface and ambient fluid. Various types of simple-shaped fins, namely, rectangular, square, annular, cylindrical, and tapered, have been used with different geometrical combinations. To satisfy industrial demand, different trials have also been carried out for designing optimized fins. The optimization of fins can be performed either by enhancing heat dissipation at an exact fin weight or by diminishing the weight of the fin by precise heat dissipation. Recently a notable amount of work on some typical fins, like, porous fins and perforated fins, has also been carried out. This paper presents a brief review on heat transfer enhancement using fins of different types considering variable thermophysical and geometric parameters, which will also be useful for future use of geometrical modifications of extended surfaces, based on the cost and availability of space.analytical approach, computational approach, experimental approach, perforated fin, porous fin | INTRODUCTIONAdvanced technologies need high-performance heat transfer equipment. Techniques for enhancing the heat transfer rate are classified into two categories: active and passive methods. In the design point of view, active methods are complex as they require some extraneous power input for necessary flow adjustments and to improve the heat transfer rate and thus applications are limited. On the other hand, passive methods require geometrical or surface adjustments to the flow passage by incorporating additional devices. Additionally, by interrupting or varying the existing flow behavior (except for extended surfaces); higher heat transfer coefficients are promoted through this method, which is also followed by an increase in the corresponding pressure drop. The amount of conduction, convection, and radiation of an object shows the amount of heat it transfers. The heat transfer rate is enhanced by increasing the temperature difference between the object and the environment or by enhancing the coefficient of convective heat transfer or by maximizing the surface area of the body. In some cases, it is not appropriate or cost effective to alter the first two options. Introducing a fin to a body, however, expands the surface area and sometimes this is a cost-effective solution for heat transfer problems. Extended surfaces or fins are illustrations of passive methods that are generally used in different industrial applications for the enhancement of heat transfer between the primary surface (heat sink) and the surrounding fluid. Currently reducing the cost and size of fins is the key target of the fin industry. This demand is generally met by the high-thermal-conductivity and costly metals used to fabricate finned surfaces. Many efforts have been made to construct optimized fins. (a) By changing the size and shape of the solid fin: Instead of a longitudinal rectangular solid fin, if the geometry of fin design is changed, the performance parameters and heat tr...

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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%

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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Pool boiling heat transfer of N-pentane on micro/nanostructured surfaces

Cited by 39 publications

References 37 publications

Pool boiling of refrigerants over nanostructured and roughened tubes

Pool boiling of refrigerants over nanostructured and roughened tubes

Improvement of heat transfer through fins: A brief review of recent developments

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

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