Molecular Dynamics Study of Contact Angle Effect on Maximum Critical Heat Flux in Nano-Patterned Pool Boiling

Diaz, Ricardo; Guo, Zhixiong

doi:10.1615/tfec2017.fnn.017510

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…A molecular-scale understanding of the dynamics, the controlling factors, and the mechanisms of boiling bubbles is crucial to design rapid and efficient boiling processes. Although some numerical studies on boiling have been conducted through molecular dynamics (MD) simulations in the past decade, − the intuitive visualization and observation of bubble nucleation and growth are lacking, and the mechanism of the initial bubble behaviors merits an in-depth interpretation.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Thin-Film Boiling Processes on Heterogeneous Surfaces

Gao

Liu

et al. 2022

Langmuir

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Acquiring rapid and efficient boiling processes has been the focus of industry as they have the potential to improve the energy efficiency and reduce the carbon emissions of production processes. Here, we report nanoscale thin-film boiling on different heterogeneous surfaces. Through nonequilibrium molecular dynamics simulation, we captured the triple-phase interface details, visualized the bubble nucleation, and recorded the internal fluid flow and thermal characteristics. It is found that nanoscale thin-film boiling without the occurrence of bubble nucleation shows excellent heat and mass transfer performance, which differs from macroscale boiling. In general, rough structures advance the onset time of stable boiling and improve the efficiency. The heat transfer coefficient and heat flux on a rough hydrophilic surface respectively reach to 7.43 × 104 kW/(m2·K) and 1.3 × 106 kW/m2 at a surface temperature of 500 K, which are 100-fold higher than those of micrometer-scale thin-film boiling. However, due to the resultant vapor film trapped between the liquid and the surface, the rough hydrophobic surface leads to heat transfer deterioration instead. It is revealed that the underlying mechanism of regulatory effects resulting from surface physicochemical properties is originated from the variation of interfacial thermal resistance. It is available to reduce the overall interfacial resistance and further improve the heat and mass transfer efficiency through increasing surface roughness, enhancing surface wettability, and increasing the area proportion of the hydrophilic region. This work provides guidelines to achieve rapid and efficient thin-liquid-film boiling and serves as a reference for the optimized design of surfaces utilized for high-heat flux removal through vaporization processes.

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Section: Introductionmentioning

confidence: 99%

Nanoscale Thin-Film Boiling Processes on Heterogeneous Surfaces

Gao

Liu

et al. 2022

Langmuir

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“…The authors proved that wettability affects boiling inception due to the wall–liquid energy interaction. Diaz and Guo , investigated the effect of wettability on nanopatterned surfaces. The authors mainly focused on the effect of solid–fluid interactions on the CHF.…”

Section: Introductionmentioning

confidence: 99%

Surface Topography Effects on Pool Boiling via Non-equilibrium Molecular Dynamics Simulations

et al. 2021

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In this work, we investigate nucleate pool boiling via non-equilibrium molecular dynamics simulations. The effect of nano-structured surface topography on nucleation and transition to a film-like boiling regime is studied at the molecular scale, by varying the cavity aspect ratio, wall superheat, and wettability through a systematic parametric analysis conducted on a Lennard-Jones (LJ) system. The interplay of the aforementioned factors is rationalized by means of a classical nucleation theory-based model. The solid surface is heated uniformly from the bottom in order to induce the nanobubble nucleation. Insight into the cavity behavior in heat transfer problems is achieved by looking at temperature and heat flux profiles inside the cavity itself, as well as at the time of nucleation, for different operating conditions. The role of the cavity size in controlling the vapor embryo formation is highlighted, and its dependence on the other investigated parameters is summarized in a phase diagram. Our results show that heterogeneity at the nanoscale plays a key role in determining pool boiling heat transfer performance, suggesting a promising approach to optimize nanostructured surfaces for energy and thermal management applications.

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Effects of wettability and heat flux on water nanofilm phase change over copper plate

Tang

Xue

et al. 2022

Applied Thermal Engineering

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Molecular Dynamics Study of Contact Angle Effect on Maximum Critical Heat Flux in Nano-Patterned Pool Boiling

Cited by 3 publications

References 35 publications

Nanoscale Thin-Film Boiling Processes on Heterogeneous Surfaces

Nanoscale Thin-Film Boiling Processes on Heterogeneous Surfaces

Surface Topography Effects on Pool Boiling via Non-equilibrium Molecular Dynamics Simulations

Effects of wettability and heat flux on water nanofilm phase change over copper plate

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