Effects of hysteresis window on contact angle hysteresis behaviour at large Bond number

Yang, Jiapei; Ma, Xiao; Fei, Linlin; Zhang, Xiaoqing; Luo, Kai H.; Shuai, Shijin

doi:10.1016/j.jcis.2020.01.042

Cited by 30 publications

(22 citation statements)

References 51 publications

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“…Recent advances in the numerical modeling of multi-phase flows allowed to establish a reliable basis for the numerical simulation of the transport of water droplets in GC 10,11,36,37 . The numerical approaches in this context can be classified within the main categories of the phase-field models and the sharp-interface capturing techniques.…”

Section: Introductionmentioning

confidence: 99%

Toward droplet dynamics simulation in polymer electrolyte membrane fuel cells: Three-dimensional numerical modeling of confined water droplets with dynamic contact angle and hysteresis

2021

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This work focuses on three-dimensional simulation of the dynamics of droplets with contact-angle hysteresis. In order to consistently model the dynamics of the contact line, a combination of the linear molecular kinetic theory and the hydrodynamic theory is implemented in the present numerical method. Without presetting the contact line and/or the contact angle, such simulations are generally prone to irregularities at the contact line, which are mainly due to the imposition of the pinning and unpinning mechanisms associated with the hysteresis phenomenon. An effective treatment for this issue is proposed based on a simple procedure for calculating the nodal contact angle within the framework of enriched finite element/level set method. The resulting method also benefits from a manipulated momentum conservation equation that incorporates the effect of the liquid mass conservation correction, which is essentially important for simulations with a rather long (physical) run-time. In this paper, the proposed numerical model is validated against the previously published experimental data addressing the configuration of a water droplet on a tilted rough hydrophobic surface. In this test, the effect of the contact-line pinning as the underlying mechanism for droplet hysteresis phenomenon is also studied. The model is further employed to simulate a liquid droplet confined in a channel in the presence of air flow.

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Section: Introductionmentioning

confidence: 99%

Toward droplet dynamics simulation in polymer electrolyte membrane fuel cells: Three-dimensional numerical modeling of confined water droplets with dynamic contact angle and hysteresis

2021

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“…Contact angle measurement plays an important role in determining the surface wettability of nano coatings, surface modifications and natural surfaces. Some of the recent studies include characterization method of intermediate wetting states, which determines the condition of anisotropic sliding on micro-grooves [1], Electromagnetically induced change in interfacial tension and contact angle of oil droplet using dielectric nanofluids [2], effects of hysteresis window on contact angle hysteresis behavior at large Bond number [3], Droplet behaviors on inclined surfaces with dynamic contact angle [4], estimating critical surface tension from droplet spreading area [5], geomaterial wettability and contact area versus three-phase contact line [6], contact angle measurements using sessile drop on six sandstones [7], analysis of the contact angle for impacting droplets using polynomial fitting [8] etc. The molecular dynamics simulations are very useful in studying nanoscale phenomena [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

Achilles: A Tool for Contact Angle Estimation from Molecular Dynamics Simulations

Yesudasan¹

2021

Preprint

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In this work, a tool for estimating the contact angle from the molecular dynamics simulations is developed and presented. The tool (Achilles) can detect water droplet on hydrophobic and hydrophilic surfaces. The tool can reconstruct the droplets broken across the periodic boundaries. Further a neighbor density based accurate filter is used to find the droplet liquid vapor interface and a circle is fitted using it after removing the dense layers of water next to solid surface. This fitted circle is solved for contact angle and results are outputted in the form of graphical images and text. The entire content of the internal computations of the tool is broken down into 4 phases and users can monitor the outcomes at every phase through output images. The tool is tested using sample molecular dynamics results of water droplet on hydrophobic and hydrophilic surfaces. We believe this tool can be a good addition to the molecular dynamics simulation community who work on the interfacial physics, droplet evaporation, super hydrophobic surfaces, and wettability etc.

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“…During the last three decades, the mesoscopic lattice Boltzmann method (LBM), based on the kinetic theory, has become an increasingly important method for numerical simulations of multiphase flows, on account of its generality, easy implementation, and computational efficiency. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Among others, the pseudopotential model has attracted significant attention in the modeling and simulation of the liquid-vapor phase-change processes. In the pseudopotential model, the interactions among populations of molecules are modeled by a density-dependent pseudopotential.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic simulation of three-dimensional pool boiling based on a phase-change cascaded lattice Boltzmann method

et al. 2020

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In this paper, a three-dimensional (3D) cascaded lattice Boltzmann method (CLBM) is implemented to simulate the liquid-vapor phasechange process. The multiphase flow field is solved by incorporating the pseudopotential multiphase model into an improved CLBM, the temperature field is solved by the finite difference method, and the two fields are coupled via a non-ideal equation of state. Through numerical simulations of several canonical problems, it is verified that the proposed phase-change CLBM is applicable for both the isothermal multiphase flow and the liquid-vapor phase-change process. Using the developed method, a complete 3D pool boiling process with up to hundreds of spontaneously generated bubbles is simulated, faithfully reproducing the nucleate boiling, transition boiling, and film boiling regimes. It is shown that the critical heat flux predicted by the 3D simulations agrees better with the established theories and correlation equations than that obtained by two-dimensional simulations. Furthermore, it is found that with the increase in the wall superheats, the bubble footprint area distribution changes from an exponential distribution to a power-law distribution, in agreement with experimental observations. In addition, insights into the instantaneous and time-averaged characteristics of the first two largest bubble footprints are obtained.

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Effects of hysteresis window on contact angle hysteresis behaviour at large Bond number

Cited by 30 publications

References 51 publications

Toward droplet dynamics simulation in polymer electrolyte membrane fuel cells: Three-dimensional numerical modeling of confined water droplets with dynamic contact angle and hysteresis

Toward droplet dynamics simulation in polymer electrolyte membrane fuel cells: Three-dimensional numerical modeling of confined water droplets with dynamic contact angle and hysteresis

Achilles: A Tool for Contact Angle Estimation from Molecular Dynamics Simulations

Mesoscopic simulation of three-dimensional pool boiling based on a phase-change cascaded lattice Boltzmann method

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