Graphene-coated sintered porous copper surfaces for boiling heat transfer enhancement

Ahmadi, Vahid; Khaksaran, Hadi; Apak, Ahmet  Muhtar; Apak, Alper; Parlak, Murat; Tastan, Umur; Kaya, İsmet I.; Sadaghiani, Abdolali Khalili; Koşar, Ali

doi:10.1016/j.cartre.2022.100171

Cited by 15 publications

(3 citation statements)

References 29 publications

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“…Thinner foam thicknesses (0.5 and 1 mm) yielded better performance than 1.5 and 2 mm due to lower vapor resistance and efficient liquid supply. Heat transfer coefficients are observed 161% higher initially at lower heat fluxes, while this increment in HTC is reduced at higher heat fluxes [20].…”

Section: G/go-cu Composite Coatingsmentioning

confidence: 91%

Graphene-Based Functional Coatings for Pool Boiling Heat Transfer Enhancements

M. Rishi

2024

Advances in Boiling and Condensation

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Pool boiling heat transfer has proven to be the most effective ways to dissipate the large amount of heat fluxes and achieve the efficient cooling in many industrial applications including high-power electronics cooling, data center cooling, heat exchangers, batteries, refrigeration, and air conditioning. With the aggressive net-zero carbon footprint goals set up by the numerous industries across the globe, the need for development of innovative two-phase cooling solutions is of utmost importance. Graphene, being the highest thermal conductivity material, has been implemented in numerous studies for improving both the critical heat flux (maximum possible heat removed before thermal runaway of the heater surface) and a heat transfer coefficient (determines how efficiently the heat is removed) in pool boiling heat transfer. Initially, this chapter introduces various graphene-based nanomaterials and basics related to structure and characterization of graphene. Later, the highlights of some of the notable research work related to the graphene-based coatings for pool boiling enhancements are discussed. The responsible mechanism for such higher performance is summarized. Concluding remarks and industrial applicability of these techniques are also discussed in this section.

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Section: G/go-cu Composite Coatingsmentioning

confidence: 91%

Graphene-Based Functional Coatings for Pool Boiling Heat Transfer Enhancements

M. Rishi

2024

Advances in Boiling and Condensation

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“…This work builds on our previous report that demonstrated a 27% increase in CHF by a sintered copper particle surface compared to plain copper surfaces. This enhancement was attributed to the vapor venting, liquid re-entry in the cavities, and liquid capillary action occurring in the porous particle matrix. − In the current study, we present a speleothem-inspired Cu/Ni surface comprising nickel particle arrays embedded in a sintered copper particle matrix. This dual-porous and wicked surface is designed to mimic the natural geological formations known as speleothems.…”

Section: Introductionmentioning

confidence: 92%

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

Rozati,

Khriwish,

Gupta

2024

Langmuir

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Geological formations have superior wickability and support the absorption of water and oils into narrow spaces of Earth's crust without external assistance. In this study, we present speleothem inspired heterogeneous porous and wicked copper (Cu)/nickel (Ni) interfaces for enhanced nucleate boiling of water/ethanol mixtures for energy-efficient separation processes. The incorporation of Ni strands within the copper particle matrix significantly enhanced heat transfer. Compared to plain copper, the Cu/Ni speleothem surfaces exhibited a 61% increase in the heat transfer coefficient for water/ ethanol mixtures and a 332% increase for water, with a 58% faster onset of nucleate boiling. This enhancement was attributed to Marangoni and Soret effects at the Cu/Ni interfaces, driven by surface tension and concentration gradients. Furthermore, the synergistic wicking action of the Ni strands facilitated rewetting of the surface, replenishing liquid to the porous nucleation sites and preventing surface dry-out, thereby improving the overall heat transfer performance.

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“…This substantial change indicates that the contact angle decrease is due to the increase in surface roughness, which is highly hydrophilic in the Wenzel regime. 28,29 The CNT, GO-coated surface is hydrophilic in nature, while CNT + GO-coated surface is superhydrophilic in nature. In Figure 3, images of all the surfaces are shown.…”

Section: Contact Angle and Surface Roughnessmentioning

confidence: 99%

Experimental comparison of pool boiling characteristics between CNT, GO, and CNT + GO‐coated copper substrate

Kumar,

Kumari,

Rahul

et al. 2024

Heat Trans

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The present investigation aims to study the comparative analysis of CNT, GO, and CNT + GO nanoparticle coatings on copper surfaces under a pool boiling situation. Coating on copper surfaces is performed using the dip coating method. Pool boiling experiments are conducted for all the coated surfaces at atmospheric pressure. Water is used as a working fluid. A comparison was made based on the coated surface characteristics and pool boiling behavior of the samples. The results show that CNT + GO coating on copper surfaces is better in terms of critical heat flux (CHF) and boiling heat transfer coefficient (BHTC). It is also observed that CHF and BHTC of the CNT + GO‐coated surface are 129.19% and 194.75% higher, respectively, compared to the bare copper surface. Bubble dynamics studies were also performed for all the samples.

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Graphene-coated sintered porous copper surfaces for boiling heat transfer enhancement

Cited by 15 publications

References 29 publications

Graphene-Based Functional Coatings for Pool Boiling Heat Transfer Enhancements

Graphene-Based Functional Coatings for Pool Boiling Heat Transfer Enhancements

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

Experimental comparison of pool boiling characteristics between CNT, GO, and CNT + GO‐coated copper substrate

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