Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature

Ilić, Milica; Stevanović, Vladimir D.; Milivojević, Sanja; Petrović, Milan M.

doi:10.1016/j.applthermaleng.2022.119749

Cited by 16 publications

(4 citation statements)

References 28 publications

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“…For the density studies, the simulation systems were divided into equal bins with a thickness of 2.00×10 -10 m in the direction of the phase change (Z-direction). The heat flux between the solid copper surface to Ar atoms was calculated by [19]:…”

Section: Atom Pairs σ (M) ε (J)mentioning

confidence: 99%

Effect of closed-loop nanochannels on the onset of explosive boiling: a molecular dynamics simulation study

Fallahzadeh,

Bozzoli,

Cattani

2024

J. Phys.: Conf. Ser.

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As a primary boiling mode, explosive boiling has shown a promising future in many applications and received much research attention. The topology of the solid surface in contact with the liquid, particularly nanostructured surfaces, significantly affects the onset time of explosive boiling of a liquid nanofilm. Most studies investigated explosive boiling on non-closed-loop (parallel) nanochannel surfaces. Here, for the first time, explosive boiling in a closed-loop nanochannel was studied by the non-equilibrium molecular dynamics simulation method. Explosive boiling of liquid argon nanofilm on solid copper surfaces with different topologies, including an ideally smooth, a non-closed-loop, and a closed-loop nanochannel, was simulated. The results showed that, compared with the ideally smooth surface, the onset time of explosive boiling decreased for the non-closed-loop and closed-loop nanochannel surfaces. However, it turned out that compared to the non-closed-loop nanochannel, using the closed-loop nanochannel has an adverse effect on heat flux and the onset time of explosive boiling.

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Section: Atom Pairs σ (M) ε (J)mentioning

confidence: 99%

Effect of closed-loop nanochannels on the onset of explosive boiling: a molecular dynamics simulation study

Fallahzadeh,

Bozzoli,

Cattani

2024

J. Phys.: Conf. Ser.

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“…As you can see, the heat measurements fluctuate a lot. To fix this, the results were smoothed out using the FFT filter with a coefficient of 0.4 (see References [4,39] for more details). The blue curves in Figure 2 present the smoothed-out results.…”

Section: Post-processing Analysismentioning

confidence: 99%

Effect of Cross Nanowall Surface on the Onset Time of Explosive Boiling: A Molecular Dynamics Study

Fallahzadeh,

Bozzoli,

Cattani

et al. 2024

Energies

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Explosive boiling is a fast-phase transition from an ultra-thin liquid film to vapor under an extremely high heat flux, which typically has been studied using the molecular dynamics simulation (MDS) method. The present MDS study investigated the explosive boiling of a liquid argon nanofilm over different solid copper surfaces with different nanowall patterns, including parallel and cross nanowalls. For each surface, atomic motion trajectories, the number of liquid and vapor argon atoms, heat flux, and, mainly, the onset time of explosive boiling were investigated. The simulation results indicated that explosive boiling occurs earlier on parallel and cross nanowall surfaces than on an ideally smooth surface, regardless of the topology and configuration of the nanowalls. Moreover, the results revealed that by using the cross nanowall surfaces, the onset time of explosive boiling decreased by 0.7–4% compared to the parallel nanowall surfaces. In addition, it was found that the onset time of explosive boiling strongly depends on the potential energy barrier and the movement space between nanowalls for both parallel and cross nanowall surfaces. Furthermore, the simulation findings showed that even though increasing the height of cross nanowalls increases the heat flux and temperature of the fluid argon domain, it does not necessarily result in a shorter onset time for explosive boiling. These findings demonstrate the capability of cross nanowall surfaces for explosive boiling, thereby being utilized in future surface design for thermal management applications.

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“…The time trends of heat fluxes for the random rough surface during normal evaporation with two different substrate temperatures (600 and 700 K) are shown in Figure 13. It is important to mention that the original data curves were smoothed by applying the Fast Fourier Transform filter [56], which is a common signal processing technique. It is important to mention that the original data curves were smoothed by applying the Fast Fourier Transform filter [56], which is a common signal processing technique.…”

Section: Transition From Cluster Boiling To Film Boilingmentioning

confidence: 99%

“…It is important to mention that the original data curves were smoothed by applying the Fast Fourier Transform filter [56], which is a common signal processing technique. It is important to mention that the original data curves were smoothed by applying the Fast Fourier Transform filter [56], which is a common signal processing technique. This post-processing was needed to reduce heat flux fluctuation due to random, instantaneous interactions, i.e., to achieve a better outline of the heat flux trends over time.…”

Section: Transition From Cluster Boiling To Film Boilingmentioning

confidence: 99%

A Molecular Dynamics Perspective on the Impacts of Random Rough Surface, Film Thickness, and Substrate Temperature on the Adsorbed Film’s Liquid–Vapor Phase Transition Regime

Fallahzadeh,

Bozzoli,

Cattani

et al. 2024

Sci

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While recent studies have proven an unexpected liquid–vapor phase transition of adsorbed liquid films, a comprehensive description of the mechanisms of different types of phase change regimes over realistic representations of random rough surfaces is absent in the literature. The current comprehensive study investigates the effects of a gold random rough surface, liquid film thickness, and substrate temperature on the liquid–vapor phase change regime of an adsorbed sodium liquid film, considering the evaporator section of a wicked heat pipe (WHP) using a molecular dynamics (MD) simulation. At first, to generate a realistic random rough surface, a new and promising method is proposed that is entirely based on MD simulations. Then, to simulate the evaporator section of a WHP, a unique configuration for eliminating the vapor domain is developed. The simulation results reveal that three distinct regimes, namely, normal evaporation, cluster boiling, and film boiling, could be identified, which are presented on two-dimensional diagrams with the substrate temperature and liquid film thickness as coordinates for the ideally smooth and random rough surfaces. The results also manifest that even though using the random rough surface could lead to different phase transition regimes, the type of regime depends mainly on the substrate temperature and liquid film thickness. Furthermore, this study displays two different modes for normal evaporation. Also, it is shown that the impacts of the liquid film thickness and substrate temperature on the mode of normal evaporation are much more significant than the surface roughness.

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Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature

Cited by 16 publications

References 28 publications

Effect of closed-loop nanochannels on the onset of explosive boiling: a molecular dynamics simulation study

Effect of closed-loop nanochannels on the onset of explosive boiling: a molecular dynamics simulation study

Effect of Cross Nanowall Surface on the Onset Time of Explosive Boiling: A Molecular Dynamics Study

A Molecular Dynamics Perspective on the Impacts of Random Rough Surface, Film Thickness, and Substrate Temperature on the Adsorbed Film’s Liquid–Vapor Phase Transition Regime

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