Multiscale modelling of nucleate boiling on nanocoatings for electronics cooling—From nanoscale to macroscale

Li, Xiangdong

doi:10.1007/s42757-020-0086-y

Cited by 20 publications

(3 citation statements)

References 37 publications

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“…However, the exact nature of the nucleation remains unclear and debatable. With advances in nanofabrication technologies and surface treatment techniques, there are unprecedented opportunities to manipulate surface wettability and enhance the efficiency of nucleate boiling. , Unfortunately, nucleate boiling is a multiscale process, ranging from nano- and microscale to the macroscale, thus posing an extreme challenge to research investigation. , Experimental studies have shown that the onset of bubble nucleation may occur at a much lower superheat threshold than classical theories predict. , Although trapping vapor in cavities on heated substrates is a widely accepted postulation for the lower energy barrier, , there is contradictory evidence that suggests an alternative nucleation mechanism could exist. Recent studies on highly wetting fluids on smooth metallic surfaces have reported a low incipient superheat temperature, where the vapor trapping mechanism is not valid .…”

Section: Introductionmentioning

confidence: 99%

“…5,6 Unfortunately, nucleate boiling is a multiscale process, ranging from nano-and microscale to the macroscale, thus posing an extreme challenge to research investigation. 7,8 Experimental studies have shown that the onset of bubble nucleation may occur at a much lower superheat threshold than classical theories predict. 9,10 Although trapping vapor in cavities on heated substrates is a widely accepted postulation for the lower energy barrier, 11,12 there is contradictory evidence that suggests an alternative nucleation mechanism could exist.…”

Section: Introductionmentioning

confidence: 99%

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A Molecular Dynamics Study on Nanobubble Coalescence Events in Heterogeneous Nucleation on a Hydrophilic Surface

Cole

et al. 2023

Ind. Eng. Chem. Res.

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The bubble nucleation process has practical applications and has garnered a significant amount of attention. In the literature, researchers have commonly accepted that the incipient of the bubble nuclei is initiated by vapor trapping in cervices on the heated substrate. However, experimental observations have found that nucleation can occur with much lower superheat temperatures on ultrasmooth surfaces where vapor trapping is not applicable. To investigate the nucleation mechanism, molecular dynamics (MD) simulations were carried out to study nanobubble nucleation behavior on smooth and grooved hydrophilic substrates. The force field of argon atoms heated by solid substrates was described by using the Lennard-Jones (LJ) 12–6 potential field. The MD results revealed that the nanobubbles that emerged on the two- and three-groove surfaces could merge, forming a metastable nucleus via the coalescence event. The coalescence event lowered the required energy cost and accelerateed the nucleation process. Energy analyses also showed the bifurcation of the energy rise between the right and left regions of grooved surfaces. Furthermore, the mean first-passage time method was used to evaluate the corresponding critical nucleus volume and nucleation rate for all grooved substrates. The results suggest that nanobubble coalescence could be an alternative pathway in the nucleation process that could reduce the critical nucleus size and its associated energy cost.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Molecular Dynamics Study on Nanobubble Coalescence Events in Heterogeneous Nucleation on a Hydrophilic Surface

Cole

et al. 2023

Ind. Eng. Chem. Res.

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“…[ 33 ] So it should be a good and feasible concept to coordinate both FCC and PDH processes, aiming at achieving both a higher C/O ratio with a low contacting temperature for the FCC reaction and sufficient heat supply for the PDH reaction. With the increase in computational capacity, computational fluid dynamics (CFD) has become a helpful approach in various complex industrial processes, [ 34–40 ] which can also be of vital importance to this innovation propagation.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of flow, heat transfer, and kinetic reaction in a large‐difference bidisperse, circulating fluidized‐bed reactor

et al. 2022

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To study particle bidispersity effect on the comprehensive performance of a gas–solid fluidized system, multi‐field coupling numerical research of large‐difference bidisperse circulating fluidized bed was performed. First, numerical simulation was conducted on the dynamic characteristic of a bidisperse gas–solid system that contained both Geldart A and B particles; heat transfer and reaction performances were then studied with the introduction of a propane dehydrogenation (PDH) kinetic reaction model; and finally, the concept of coupling fluid catalytic cracking (FCC) and PDH processes was proposed, and the feasibility was preliminarily discussed. The results showed that the two particle phases were hierarchically distributed with a pronounced segregation layer due to their large‐difference bidispersity characteristic, the Geldart B‐type particle was in a bubbling fluidizing state, while the Geldart A‐type particle was in a turbulent fluidizing state. With the initialized bed and regeneration temperature set to 973 K, the regenerated catalyst's final, balanced temperature could decrease to 942 K, which demonstrated that a significant decline in contact temperature between the feedstock and catalyst could be achieved in the following FCC risers. Additionally, this coupling process also achieved a nearly complete conversion of propane into propene, with a conversion efficiency of above 95%. The results showed the feasibility of this coupling process, which could optimize FCC riser reaction conditions and further achieve a higher‐valued light gas yield. This research can provide a reference for the study of the bidispersity effect on a gas–solid system, and the introduced coupling process can provide a new model for the FCC process's optimization.

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Lattice Boltzmann study on the effects of surface nanostructure on wettability with application in laser scanning fabrication of superhydrophobic surfaces

Huang,

Guo,

et al. 2023

Sci. China Technol. Sci.

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Multiscale modelling of nucleate boiling on nanocoatings for electronics cooling—From nanoscale to macroscale

Cited by 20 publications

References 37 publications

A Molecular Dynamics Study on Nanobubble Coalescence Events in Heterogeneous Nucleation on a Hydrophilic Surface

A Molecular Dynamics Study on Nanobubble Coalescence Events in Heterogeneous Nucleation on a Hydrophilic Surface

Numerical investigation of flow, heat transfer, and kinetic reaction in a large‐difference bidisperse, circulating fluidized‐bed reactor

Lattice Boltzmann study on the effects of surface nanostructure on wettability with application in laser scanning fabrication of superhydrophobic surfaces

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