Molecular dynamics simulation of the evaporation of thin liquid sodium film on the conical nanostructure surface

Wang, Zetao; Ye, Tianzhou; Guo, Kailun; Wang, Chenglong; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.pnucene.2023.104795

Cited by 1 publication

(2 citation statements)

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“…MD simulations of ultra-thin liquid film phase change over simple geometric nanostructure shapes, for example, grooved [4][5][6], cubical [7][8][9][10], conical [11][12][13][14], and spherical [15][16][17] nanostructures, have been widely and intensively studied. Regardless of their shapes, the simple geometric nanostructures do not exhibit a real non-smooth surface morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Sodium WHPs were chosen because their working liquid (Na) is computationally more efficient and common for MD simulations of liquid-vapor phase change transition studies (see Refs. [14,22,26,27], for example) compared to other common WHPs' working fluids (e.g., water, methanol, etc.). Moreover, the employed random rough surface is entirely generated by means of the MD technique, and to the authors' best knowledge, this is the first attempt to fabricate a random surface entirely based on the MD technique and capable of providing a more realistic representation of existing surface topographies.…”

Section: Introductionmentioning

confidence: 99%

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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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