Enhancement of critical heat flux (CHF) in pool boiling with anodized copper surfaces

Ranjan, Atul; Ahmad, Israr; Gouda, Rinku Kumar; Pathak, Manabendra; Khan, Mohd. Kaleem

doi:10.1016/j.ijthermalsci.2021.107338

Cited by 26 publications

(3 citation statements)

References 35 publications

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“…Furthermore, a more promising method for enhancing boiling heat transfer involves tailoring surface morphology and topology. Various techniques, including electrochemical processes [31,32], chemical vapor deposition [33], laser texturing [34,35], and wet/dry etching [36], have been employed to fabricate surfaces with porous structures [37], micropin fins [38], nanowire and nanoflower structures [39], and microcavities [40] on boiling interfaces. Surfaces with tailored interfaces have demonstrated increased CHF due to augmented liquid supply.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Wettability on Nanoparticle Deposition during Pool Boiling on Laser-Textured Copper Surfaces

Berce,

Hadžić,

Može

et al. 2024

Nanomaterials

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Prior studies have evidenced the potential for enhancing boiling heat transfer through modifications of surface or fluid properties. The deployment of nanofluids in pool boiling systems is challenging due to the deposition of nanoparticles on structured surfaces, which may result in performance deterioration. This study addresses the use of TiO2–water nanofluids (mass concentrations of 0.001 wt.% and 0.1 wt.%) in pool boiling heat transfer and concurrent mitigation of nanoparticle deposition on superhydrophobic laser-textured copper surfaces. Samples, modified through nanosecond laser texturing, were subjected to boiling in an as-prepared superhydrophilic (SHPI) state and in a superhydrophobic state (SHPO) following hydrophobization with a self-assembled monolayer of fluorinated silane. The boiling performance assessment involved five consecutive boiling curve runs under saturated conditions at atmospheric pressure. Results on superhydrophilic surfaces reveal that the use of nanofluids always led to a deterioration of the heat transfer coefficient (up to 90%) compared to pure water due to high nanoparticle deposition. The latter was largely mitigated on superhydrophobic surfaces, yet their performance was still inferior to that of the same surface in water. On the other hand, CHF values of 1209 kW m−2 and 1462 kW m−2 were recorded at 0.1 wt.% concentration on both superhydrophobic and superhydrophilic surfaces, respectively, representing a slight enhancement of 16% and 27% compared to the results obtained on their counterparts investigated in water.

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Section: Introductionmentioning

confidence: 99%

Effect of Surface Wettability on Nanoparticle Deposition during Pool Boiling on Laser-Textured Copper Surfaces

Berce,

Hadžić,

Može

et al. 2024

Nanomaterials

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“…Different surface modification techniques have been extensively employed for the enhancement of pool boiling heat transfer. They are: sintering, electron beam evaporation, micromachinings, , lithography, , anodization, , microelectromechanical systems (MEMS) techniques, electrodeposition, , chemical vapor deposition, , sandblasting, physical vapor deposition, laser-induced machinings, brazing, , deposition of nanoparticles or surfactants, , flame spraying, plasma spraying, etc. For the wide-range applicability of the surface modification technique, it should be robust, scalable, less time-consuming, cost-effective, and mechanically stable/durable for long-term applications.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of Pool Boiling with Scalable Plasma-Sprayed Aluminum Coatings

et al. 2023

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To ensure adequate reliability in two-phase cooling systems involving boiling, it is essential to enhance the heat transfer coefficient and maximize the critical heat flux (CHF) limit. A key technique to avoid surface burnout and increase the CHF limit in pool boiling is the frequent coolant supply to the probable dry-out locations. In the present work, we have explored the plasma-spray coating as a surface modification technique for enhancing heat transfer coefficient and CHF value in pool boiling applications. Three plasma-coated aluminum surfaces (C-15, C-20, and C-25) are fabricated on a copper substrate at three different plasma powers of 15, 20, and 25 kW, respectively. Detailed surface morphologies of the plasma-sprayed coatings are presented, and their roles in pool boiling heat transfer mechanisms are analyzed. Plasma-coated surfaces exhibit wickability characteristics and enhanced wettability compared to the plain copper surface. Saturated pool boiling experiments are performed with DI (deionized) water at atmospheric pressure. Plasma spray-coated surfaces show favorable boiling incipience with less wall superheat and more active nucleation sites than the plain copper surface. Compared to the plain copper surface, enhancement values of nearly 68, 60.7, and 55.5% in the heat transfer coefficient are observed for C-15, C-20, and C-25 plasma-coated surfaces, respectively. Experiments could not be performed beyond the heat flux of 197 W/cm 2 due to repeated failure of the cartridge heaters. Based on the experimental measurement of wickabilities, the CHF values of plasma-coated surfaces have been theoretically calculated. Compared to the plain copper surface, a maximum 2.39 times higher CHF value is observed for C-15 plasma-coated surface. Improved wettability and wickability are responsible for CHF enhancement in the case of plasma-coated surfaces. At higher heat flux, capillary wicking and frequent rewetting of the dryout locations delay the burnout phenomenon, enhancing CHF in plasma-coated surfaces. The plasma-spray coating is a robust and scalable process, which can be a potential candidate for high heat flux dissipation in various industrial applications. ■ HIGHLIGHTS • Plasma-sprayed aluminum coatings are fabricated on the copper substrate. • Surface characteristics of plasma-coated surfaces are explored. • Plasma-coated surfaces exhibit enhanced wettability and wickability behavior. • Pool boiling heat transfer characteristics of plasmacoated surfaces are analyzed. • Plasma-coated surfaces have enhanced CHF and HTC than the plain copper surface.

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“…Study of pool boiling heat transfer with experimental approach has been the dominant path of research in the recent years. Modified heater surfaces, such as porous surface structures were tested by Zhang et al [14], Huang et al [15], Mehdikhani et al [16], and other types of modified heater surfaces, e.g., Ranjan et al [17], Nirgude and Sahu [18], Singh and Sharma [19], were subjected to pool boiling experiments and had shown enhanced heat transfer characteristics. On the other hand, there are many different theoretical models of bubble growth [6,20,21] and also a large number of approaches with simulation of pool boiling [22][23][24][25][26] available in the heat transfer literature.…”

Section: Introductionmentioning

confidence: 99%

Physical Model of a Single Bubble Growth during Nucleate Pool Boiling

Voglar¹

2022

Fluids

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A simplified physical model of a single bubble growth during nucleate pool boiling was developed. The model was able to correlate the experimentally observed data of the bubble’s growth time and its radius evolution with the use of the appropriate input parameters. The calculated values of separated heat fluxes from the heater wall, thermal boundary layer, and to the bulk liquid gave us a new insight into the complex mechanisms of the nucleate pool boiling process. The thermal boundary layer was found to supply the majority of the heat to the growing bubble. The heat flux from the thermal boundary layer to the bubble was found to be close to the Zuber’s critical heat flux limit (890 kW/m2). This heat flux was substantially larger than the input heater wall heat flux of 50 kW/m2. The thermal boundary layer acts as a reservoir of energy to be released to the growing bubble, which is filled during the waiting time of the bubble growth cycle. Therefore, the thickness of the thermal boundary layer was found to have a major effect on the bubble’s growth time.

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Enhancement of critical heat flux (CHF) in pool boiling with anodized copper surfaces

Cited by 26 publications

References 35 publications

Effect of Surface Wettability on Nanoparticle Deposition during Pool Boiling on Laser-Textured Copper Surfaces

Effect of Surface Wettability on Nanoparticle Deposition during Pool Boiling on Laser-Textured Copper Surfaces

Heat Transfer Characteristics of Pool Boiling with Scalable Plasma-Sprayed Aluminum Coatings

Physical Model of a Single Bubble Growth during Nucleate Pool Boiling

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