Preface

Yoshino, Masato; TAKADA, Naoki

doi:10.1299/jcst.2.294

Cited by 2 publications

(1 citation statement)

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“…The Lattice Boltzmann Method (LBM) has been extensively used in the field of microfluidics, including extensions to accommodate non-ideal effects [66], coupling with polymer micro mechanics [67] and thermal fluctuations [68,69]. LBM has also been used widely for the modelling of droplet break up behaviour [41,44,[70][71][72][73][74][75][76][77]. In order to model multicomponent systems with the Lattice Boltzmann Model (LBM) we need to account for interfacial forces between different fluid components.…”

Section: Lattice Boltzmann Algorithms and Methodsmentioning

confidence: 99%

Lattice Boltzmann simulations of droplet breakup in confined and time-dependent flows

et al. 2020

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We study droplet dynamics and breakup in generic time-dependent flows via a multicomponent Lattice Boltzmann algorithm, with emphasis on flow start up conditions. We first study droplet breakup in a confined oscillatory shear flow via two different protocols. In one set up, we start from an initially spherical droplet and turn on the flow abruptly ("shock method"); in the other protocol, we start from an initially spherical droplet as well, but we progressively increase the amplitude of the flow, by allowing the droplet to relax to the steady state for each increase in amplitude, before increasing the flow amplitude again ("relaxation method"). The two protocols are shown to produce substantially different breakup scenarios. The mismatch between these two protocols is also studied for variations in the flow topology, the degree of confinement and the inertia of the fluid. All results point to the fact that under extreme conditions of confinement the relaxation protocols can drive the droplets into metastable states, which break only for very intense flow amplitudes, but their stability is prone to external perturbations, such as an oscillatory driving force. * felix.milan@roma2.infn.it † biferale@roma2.infn.it ‡ sbragaglia@roma2.infn.it § f.toschi@tue.nl arXiv:1910.05660v1 [physics.flu-dyn]

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