Phase-field model-based simulation of two-phase fluid motion on partially wetted and textured solid surface

Tsuji, Naoki; Matsumoto, Junichi; Matsumoto, Sohei; Kurihara, Kazuma

doi:10.1016/j.jocs.2016.05.009

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…It should be noted that the incompressible Navier-Stokes equation and phase-field equation are recovered from the lattice Boltzmann equations by applying the Chapman-Enskog expansion under small Mach number condition [31,32]. The diffuse-interface lattice Boltzmann method has been successfully applied to several multiphase flow problems [33][34][35].…”

Section: Methodsmentioning

confidence: 99%

Rheology of a dilute ferrofluid droplet suspension in shear flow: Viscosity and normal stress differences

Ishida

Matsunaga

2020

Phys. Rev. Fluids

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We report the rheology of a dilute ferrofluid droplet suspension under simple shear flow, using the three-dimensional lattice-Boltzmann simulation and the phase-field model. In our simulation, we utilize 12M computational grids to fully resolve the droplet deformation, and GPU parallelization is used to speed up the computation. The droplet deformation is determined by both the background shear flow and the external magnetic field effects. The ferrofluid droplet has a character to elongate in the direction of the external field, and a uniform static magnetic field is applied to the system to control the droplet shape. By changing the external field strength and direction, we found that the suspension rheologies can be drastically modified. The viscosity increase (decrease) with the external field when the external field is applied to the velocity gradient direction (velocity direction). Just by imposing the external magnetic field, the specific viscosity becomes 12 ∼ 620% of the viscosity under no external magnetic field. The magnetic force is also practical to control the normal stresses, since the normal stress in ith direction decreases when the magnetic field is applied to the ith direction. Therefore, in order to increase (decrease) the first normal stress difference N 1 , the external magnetic field should be applied to the velocity direction (velocity gradient direction). To increase (decrease) the second normal stress difference N 2 , the external magnetic field should be applied to the velocity gradient direction (vorticity direction). By applying the magnetic field, we also show that the normal stresses N 1 , N 2 even show opposite sign from the normal droplet solution (N 1 > 0, N 2 < 0) under small-Reynolds-number conditions. Our work suggests that the ferrofluid droplet would be a practical complex fluid to control the suspension properties, just by changing the external magnetic field strength and directions.

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Section: Methodsmentioning

confidence: 99%

Rheology of a dilute ferrofluid droplet suspension in shear flow: Viscosity and normal stress differences

Ishida

Matsunaga

2020

Phys. Rev. Fluids

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“…The effect of the surface nanostructure on the wettability will be considered in terms of variation in the contact angle, similar to the present study. Simultaneously, the micrometre-sized surface structures will be modelled approximately with cubic cells of a regular 3D spatial grid, similarly to the previous study on microdroplets on a grooved solid surface [ 34 ]. Moreover, fractal theory [ 39 , 40 ] will be applied to numerical simulations of fluid motion in a capillary tube—within the framework of macroscopic two-phase fluid dynamics—to study the effect of electrical charge on the nanostructured surface wettability and capillary pressure.…”

Section: Discussionmentioning

confidence: 99%

“…To qualitatively investigate the effect of the nanostructured surface on the capillary tube, a simple numerical simulation of the two-phase fluid flow was performed in 2D by using the phase-field, model-based computational fluid dynamics (CFD) method [ 34 ]. In the CFD method, an interface between different fluid phases is autonomously formed as a finite volumetric zone, across which physical properties vary continuously from one phase to another phase based on the free-energy theory [ 35 ].…”

Section: Design and Numerical Simulation Of The Capillary Tubementioning

confidence: 99%

Capillary Effect Enhancement in a Plastic Capillary Tube by Nanostructured Surface

2021

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We investigated the enhancement of the capillary effect in a plastic capillary tube using only a nanostructured surface. Since plastic is a hydrophobic material, the capillary effect does not emerge without an additional coating or plasma treatment process. Therefore, capillary effect enhancement by the nanostructure fabrication method is expected to reduce the cost and minimise the contamination produced in the human body. By combining a hydrophilic nylon resin and a nanostructure at the tip of the plastic pipette, we could confirm that the capillary effect was produced solely by the tube fabrication process. The produced capillary effect increased linearly with increasing nanostructure height when a standard solution with a surface tension of 70 mN·m−1 was used. Thus, we can conclude that including the plastic part with nanostructure can be useful for biomedical applications. In addition, we suggest that the proposed method is highly effective in controlling the wetting properties of plastic surfaces, compared to the typical coating or plasma treatment processes.

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“…Other presenters focussed on various lattice Boltzmann applications, such as the simulation of harbour seal vibrissae [10], diffusivity and reactivity of nanoporous catalyst media [9], rare cell capture in obstacle arrays [3] and the PowerFLOW solver for multicomponent engineering applications [12]. A specific emphasis was put on droplet dynamics through various simulation methods, including droplet dynamics in confinement [4], bounce regime of droplet collisions [19], contact angle hysteresis of microdroplets on structured surfaces [2] and phase-field simulations of partially wetted and textured surfaces [16]. One of the conference topics was multiscale problems in fluid dynamics, for instance the coupling for lattice Boltzmann and conventional Navier-Stokes solvers [11], a hybrid molecular-dynamics/fluctuating-hydrodynamics model [5] and direct-simulation-Monte-Carlo/lattice-Boltzmann mapping for gas flows [15].…”

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confidence: 99%

The 24th International Conference on Discrete Simulation of Fluid Dynamics in Edinburgh, Scotland

Henrich

Nash

Patil

et al. 2016

Journal of Computational Science

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The Discrete Simulation of Fluid Dynamics (DSFD) series of conferences originated with the 1986 Los Alamos conference organised by Gary D. Doolen. Since that time, the DSFD conferences have emerged as the premier forum for researchers in the field, and many exciting new discoveries in lattice models of fluid dynamics have been announced at DSFD conferences. Topics emphasised at these meetings include lattice Boltzmann schemes, dissipative particle dynamics, smoothed-particle hydrodynamics, direct simulation Monte Carlo, molecular dynamics, quantum Monte Carlo methods, multiparticle collision dynamics and hybrid methods. At the 23rd edition of DSFD in Paris 2014, we were given the privilege of organising the 24th running of the meeting series in Edinburgh, from 13th to 17th July 2015 at the Royal Society of Edinburgh, which names Adam Smith, Joseph Black and Benjamin Franklin among its founding fellows. Edinburgh is Scotland's truly cosmopolitan capital. Apart from its amazing castle and Arthur's Seat (an ancient volcanic plug), parts of the city centre are UNESCO World Heritage Sites. Numerous famous scientists have been born or worked in Edinburgh, for example Alexander Graham Bell, Max Born, Charles Darwin, Peter Higgs or James Clerk Maxwell. We were delighted to host a total of 164 attendees, 60 of whom were students, from 21 countries. We enjoyed twelve invited talks and 100 contributed talks.

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Phase-field model-based simulation of two-phase fluid motion on partially wetted and textured solid surface

Cited by 16 publications

References 24 publications

Rheology of a dilute ferrofluid droplet suspension in shear flow: Viscosity and normal stress differences

Rheology of a dilute ferrofluid droplet suspension in shear flow: Viscosity and normal stress differences

Capillary Effect Enhancement in a Plastic Capillary Tube by Nanostructured Surface

The 24th International Conference on Discrete Simulation of Fluid Dynamics in Edinburgh, Scotland

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