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The Journal of Engineering

Molecular dynamics approach to thin-film liquid phase change phenomena on functionally gradient wettability surface

Content Provider	IET Digital Library
Author	Thakur, Md Shajedul Hoque Islam, Mahmudul Alam, Shahriar Hasan, Mohammad Nasim Mitsutake, Yuichi Monde, Masanori
Abstract	An atomistic model of functionally gradient wettability (FGW) surface for molecular dynamics (MD) simulation has been proposed and developed. Using the present model, a non-equilibrium MD study has been conducted to investigate the effects of FGW on liquid thin film phase change characteristics over the FGW surface. A power function has been considered as the wettability governing function of the FGW surface and by varying its function parameter, various FGW surfaces have been studied. The simulation results show that the function parameter can be a significant modulation parameter for heat transfer characteristics associated with the phase transition. To gain insight into any additional heat transfer mode associated with the FGW surface, the wall heat fluxes have been compared with linear mixture rule predictions. It is found that, along with conduction heat transfer through the interface between solid FGW surface and liquid thin film, there exists convective heat transfer along the wettability gradient direction. This additional heat transfer mode, which is not present for uniformly wetted surfaces, causes significant enhancement of phase change characteristics. The results of the present MD simulation have been found consistent with macroscopic prediction based on classical thermodynamics theory.
Starting Page	455
Ending Page	460
Page Count	6
Volume Number	15
e-ISSN	17500443
Issue Number	Issue 7, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/mnl/15/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/mnl.2019.0657
Journal	Micro & Nano Letters
Publisher Date	2020-06-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Additional Heat Transfer Mode Conduction Heat Transfer Convection Convection And Heat Transfer Convective Heat Transfer Function Parameter Functionally Gradient Wettability Surface Heat Conduction Heat Transfer Heat Transfer Characteristic Liquid Film Liquid Thin Film Liquid Thin Film Phase Change Characteristic Molecular Dynamics Method Nonequilibrium MD Study Numerical Approximation And Analysis Power Function Solid FGW Surface Thermodynamics Thin-film Liquid Phase Change Phenomena Uniformly Wetted SurFace Wettability Governing Function Wettability Gradient Direction Wetting
Content Type	Text
Resource Type	Article

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