A molecular dynamics study on thin film liquid boiling characteristics under rapid linear boundary heating: Effect of liquid film thickness

Rabbi, Kazi Fazle; Tamim, Saiful Islam; Faisal, A. H. M.; Mukut, Khaled Mosharraf; Hasan, Mohammad Nasim

doi:10.1063/1.4984731

Cited by 16 publications

(3 citation statements)

References 15 publications

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“…In addition, for simulation systems with a liquid film thickness of 4-9 nm, increasing the substrate temperature changes the phase transition regime from normal evaporation to film boiling. Even though the dependency of the mode of phase transition on the liquid film thickness has been reported in very few previous studies [47][48][49], the presented data show that the introduction of the random rough surface could also change the phase transition regime (for a particular simulation system: Case B2-800; highlighted with a black box in Figure 6), which will be thoroughly discussed in the subsequent subsection.…”

Section: Overview Of Phase Transition Regimesmentioning

confidence: 63%

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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Section: Overview Of Phase Transition Regimesmentioning

confidence: 63%

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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“…The simulation system is schematically shown in Figure 1a,b. To save computation resources and improve computation efficiency, argon atoms were used as the phase-change medium, which is a universal medium for the studies of liquid film heat transfer at the nanoscale [21,28]. Simpler gold-like atoms are used to build the substrate, which are created with face-center cubic unit (FCC) that has a constant lattice of 4.08 Å.…”

Section: Simulation Methodsmentioning

confidence: 99%

Effect of the Hybrid Hydrophobic-Hydrophilic Nanostructured Surface on Explosive Boiling

Liao

Duan

2021

Coatings

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The influence of different wettability on explosive boiling exhibits a significant distinction, where the hydrophobic surface is beneficial for bubble nucleation and the hydrophilic surface enhances the critical heat flux. Therefore, to receive a more suitable surface for the explosive boiling, in this paper a hybrid hydrophobic–hydrophilic nanostructured surface was built by the method of molecular dynamics simulation. The onset temperatures of explosive boiling with various coating thickness, pillar width, and film thicknesses were investigated. The simulation results show that the hybrid nanostructure can decrease the onset temperature compared to the pure hydrophilic surface. It is attributed to the effect of hydrophobic coating, which promotes the formation of bubbles and causes a quicker liquid film break. Furthermore, with the increase of the hydrophobic coating thickness, the onset temperature of explosive boiling decreases. This is because the process of heat transfer between the liquid film and the hybrid nanostructured surface is inevitably enhanced. In addition, the onset temperature of explosive boiling on the hybrid wetting surface decreases with the increase of pillar width and liquid film thickness.

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“…The effect of the thickness of the liquid film on the phase transition mechanism (evaporation or explosive boiling) was examined by Rabbi et al [12] by means of MD simulations of liquid argon over a hot wall. According to these results, phase change occurs by evaporation for the two thinner films, whereas the two thicker films undergo explosive boiling.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study

Shahmardi¹,

Tammisola²,

Chinappi³

et al. 2020

Preprint

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We study the role of surface topology, surface chemistry, and wall superheat temperature on the onset of boiling, bubble nucleation and growth, and the possible formation of an insulating vapour film by means of large-scale MD simulations. In the numerical experiments, we control the system pressure by imposing a constant force on a moving piston. The simulations reveal that the presence of a nanostructure triggers the bubble formation, determines the nucleation site and facilitates the energy transfer from the hot substrate to the water.The surface chemistry, on the other hand, governs the shape of the formed bubble. A hydrophilic surface chemistry accelerates the bubble nucleation, however, decelerates the bubble expansion, thus postponing the formation of the film of vapour. Therefore, a hydrophilic surface provides better energy transfer from the hot wall to the water. By analysing the system energy, we show that irrespective of wall topology and chemistry, there is a wall temperature for which the amount of transferred energy is maximum.

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A molecular dynamics study on thin film liquid boiling characteristics under rapid linear boundary heating: Effect of liquid film thickness

Cited by 16 publications

References 15 publications

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

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

Effect of the Hybrid Hydrophobic-Hydrophilic Nanostructured Surface on Explosive Boiling

Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study

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