Effects of thermal fluctuations in the fragmentation of a nanoligament

Xue, Xiao; Sbragaglia, Mauro; Biferale, Luca; Toschi, Federico

doi:10.1103/physreve.98.012802

Cited by 17 publications

(10 citation statements)

References 49 publications

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“…In the recent investigation by Liu et al [71], the authors report numerical simulations with an axisymmetric LBM with a color-gradient model and MRT collision operator. Finally, in the recent simulations by some of the authors with the Shan-Chen force for a multicomponent fluid and MRT forcing scheme, it was found the emergence of the satellite droplets [77]. These facts said, it is likely that the missed formation of satellite droplets in our MRT simulations originates from the chosen EoS and the choice of a viscosity ratio that sensibly differs from one.…”

Section: Resultsmentioning

confidence: 56%

Hydrodynamic behavior of the pseudopotential lattice Boltzmann method for interfacial flows

et al. 2019

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The lattice Boltzmann method (LBM) is routinely employed in the simulation of complex multiphase flows comprising bulk phases separated by non-ideal interfaces. LBM is intrinsically mesoscale with an hydrodynamic equivalence popularly set by the Chapman-Enskog analysis, requiring that fields slowly vary in space and time. The latter assumptions become questionable close to interfaces, where the method is also known to be affected by spurious non hydrodynamical contributions. This calls for quantitative hydrodynamical checks. In this paper we analyze the hydrodynamic behaviour of LBM pseudo-potential models for the problem of break-up of a liquid ligament triggered by the Plateau-Rayleigh instability. Simulations are performed at fixed interface thickness, while increasing the ligament radius, i.e. in the "sharp interface" limit. Influence of different LBM collision operators is also assessed. We find that different distributions of spurious currents along the interface may change the outcome of the pseudo-potential model simulations quite sensibly, which suggests that a proper fine-tuning of pseudo-potential models in time-dependent problems is needed before the utilization in concrete applications. Taken all together, we argue that the results of the proposed study provide a valuable insight for engineering pseudo-potential model applications involving the hydrodynamics of liquid jets.

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Section: Resultsmentioning

confidence: 56%

Hydrodynamic behavior of the pseudopotential lattice Boltzmann method for interfacial flows

et al. 2019

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“…In addition to the phenomenological MM-model we can use fully resolved Lattice Boltzmann simulations [55,56] to study sub-Kolmogorov droplet dynamics and breakup in homogeneous and isotropic turbulent flows. The Lattice Boltzmann Method (LBM) has been extensively used in the field of microfluidics, including extensions to accommodate non-ideal effects [57], coupling with polymer micro mechanics [58] and thermal fluctuations [47,48]. LBM has also been widely used for the modelling of droplet breakup behaviour [31,38,39,40,41,42,43,44,45,46].…”

Section: The Mm-model and The Lattice Boltzmann Algorithmmentioning

confidence: 99%

“…LBM in conjunction with SCM has been extensively used in the field of microfluidics and droplet breakup [31,38,39,40,41,42,43,44,22,45,46] and notably also for multicomponent systems involving thermal fluctuations [47,48].…”

Section: Introductionmentioning

confidence: 99%

Sub-Kolmogorov droplet dynamics in isotropic turbulence using a multiscale lattice Boltzmann scheme

Milan

Biferale

Sbragaglia

et al. 2020

Journal of Computational Science

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The deformation and dynamics of a single droplet in isotropic turbulence is studied using a Lattice Boltzmann diffuse interface model involving exact boundary flow conditions [1] to allow for the creation of an external turbulent flow. We focus on a small, sub-Kolmogorov droplet, whose scale is much smaller than the Kolmogorov length scale of the turbulent flow. The external flow field is obtained via pseudo-spectral simulation data describing the trajectory of a passive tracer in isotropic turbulence. In this way we combine the microscopic scale of the droplet and the macroscopic scale of the turbulent flow. The results obtained from this fully resolved model are compared to previous studies on sub-Kolmogorov droplet dynamics in isotropic turbulent flows [2], where an analytical model [3], which assumes the droplet shape to be an ellipsoid at all times, is used to describe the droplet deformation. Our findings confirm, that the hybrid pseudo-spectral Lattice Boltzmann algorithm is able to study droplet deformation and breakup in a regime well beyond the ellipsoidal approximation.

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“…Especially in the last decade, there has been a boost to push the applicability of LBM simulations toward nano-scales via the inclusion of thermal fluctuations [ 25 – 29 , 31 ], designing the so-called fluctuating lattice Boltzmann methodology (FLBM). This methodology has been recently applied to the study of multicomponent fluids in the presence of thermal fluctuations [ 32 , 33 ] and also to study the effects of thermally excited capillary waves on the break-up properties of a thin liquid ligament [ 34 ]. In this paper, we couple the FLBM with a wetted finite-size particle model [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

A lattice Boltzmann study of particle settling in a fluctuating multicomponent fluid under confinement

et al. 2021

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We present mesoscale numerical simulations based on the coupling of the fluctuating lattice Boltzmann method for multicomponent systems with a wetted finite-size particle model. This newly coupled methodologies are used to study the motion of a spherical particle driven by a constant body force in a confined channel with a fixed square cross section. The channel is filled with a mixture of two liquids under the effect of thermal fluctuations. After some validations steps in the absence of fluctuations, we study the fluctuations in the particle’s velocity at changing thermal energy, applied force, particle size, and particle wettability. The importance of fluctuations with respect to the mean settling velocity is quantitatively assessed, especially in comparison with unconfined situations. Results show that the expected effects of confinement are very well captured by the numerical simulations, wherein the confinement strongly enhances the importance of velocity fluctuations, which can be one order of magnitude larger than what expected in unconfined domains. The observed findings underscore the versatility of the proposed methodology in highlighting the effects of confinement on the motion of particles in the presence of thermal fluctuations.

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Effects of thermal fluctuations in the fragmentation of a nanoligament

Cited by 17 publications

References 49 publications

Hydrodynamic behavior of the pseudopotential lattice Boltzmann method for interfacial flows

Hydrodynamic behavior of the pseudopotential lattice Boltzmann method for interfacial flows

Sub-Kolmogorov droplet dynamics in isotropic turbulence using a multiscale lattice Boltzmann scheme

A lattice Boltzmann study of particle settling in a fluctuating multicomponent fluid under confinement

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