Effects of different concentrations of Al2O3 nanoparticles and base fluid types on pool boiling heat transfer in copper foam with bottom condensed reflux

Liu, Rui; Teng, Zecheng; Yao, Shouguang; Xu, Jingya; Yang, Song

doi:10.1016/j.ijthermalsci.2021.106833

Cited by 14 publications

(2 citation statements)

References 54 publications

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“…Copper foam with a higher number of pores is more conducive to enhanced the boiling heat transfer, yet this enhancement weakened when the PPI reached 50. Liu et al (2021) even found that high pore density copper foam decreases boiling heat transfer. This issue may be solved by the use of gradient metal foam.…”

Section: Introductionmentioning

confidence: 99%

Boiling Heat Transfer in Copper Foam Bilayers in Positive and Inverse Gradients of Pore Density

Wang

Ying

Lichtfouse

et al. 2023

JAFM

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Gradient metal foam is an advanced heat transfer material that decreases resistance to bubble escape and enhances the transfer of boiling heat. In this study, boiling heat transfer and bubble behavior were studied in an experimental set-up with copper foam bilayers configurated either in positive or inverse gradients, utilizing deionized water as working fluid. Positive gradient refers to arranging metal foam layers with high pore density at the bottom, above the heat source, and low pore density on the top. Results show that the heat transfer is higher for gradient metal foam surfaces, of 6.14×105 W/m2, versus a uniform metal foam surface, of 3.94×105 W/m2. For the positive gradient configuration, boiling heat transfer performance first increased with the pore density, then decreased when the pore density was higher than 60 pores per inch (PPI). By contrast, for the inverse gradient, the heat transfer performance was nearly constant with increasing pore density. At the low pore density, the inverse gradient performed better than the positive gradient during the whole boiling process. At high pore density, the positive gradient structure performed better in heat transfer at the early boiling stage. Three main types of bubble escape were observed: For the positive gradient bilayer, the bubbles moved up or down without lateral interference. In contrast, for inverse gradient, the bubbles mostly escape from the sides, which is easy to induce bubble merging. The inverse gradient surface generates larger bubbles, while the positive gradient surface produces a higher frequency of bubble detachment. Accordingly, two liquid replenishment models are proposed: for the positive gradient, external liquid replenishes from the side into the copper foam, while for inverse gradient, the liquid is mainly replenished from the top.

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Section: Introductionmentioning

confidence: 99%

Boiling Heat Transfer in Copper Foam Bilayers in Positive and Inverse Gradients of Pore Density

Wang

Ying

Lichtfouse

et al. 2023

JAFM

View full text Add to dashboard Cite

show abstract

“…In addition, the type of working fluid is also the other factor to influence pool boiling heat transfer. The thermal conductivity of working fluids can be improved by adding nanoparticles [27].…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of mixed wettability of micro-nano porous surface on boiling heat transfer enhancement

Xiao

et al. 2023

Thermal Science and Engineering Progress

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The mechanism of boiling heat transfer of polycarboxylate superplasticizer modified stereotaxically constructed graphene water-based nanofluid: Experiment and molecular dynamics simulation

He,

Chen,

et al. 2024

Applied Thermal Engineering

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Effects of different concentrations of Al2O3 nanoparticles and base fluid types on pool boiling heat transfer in copper foam with bottom condensed reflux

Cited by 14 publications

References 54 publications

Boiling Heat Transfer in Copper Foam Bilayers in Positive and Inverse Gradients of Pore Density

Boiling Heat Transfer in Copper Foam Bilayers in Positive and Inverse Gradients of Pore Density

Synergistic effect of mixed wettability of micro-nano porous surface on boiling heat transfer enhancement

The mechanism of boiling heat transfer of polycarboxylate superplasticizer modified stereotaxically constructed graphene water-based nanofluid: Experiment and molecular dynamics simulation

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