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lattice approaches to packed column simulations

Particuology 2008年第6期6卷 404-411页

作者： Richard Caulkin Mike Fairweather Richard A. Williams Institute of Particle Science and Engineering School of ProcessEnvironmental and Materials EngineeringUniversity of Leeds

This work presents a review of the findings into the ability of a digitally based particle packing algorithm, called DigiPac, to predict bed structure in a variety of packed columns, for a range of generic pellet shapes frequently used in the chemical and process engineering industries. Resulting macroscopic properties are compared with experimental data derived from both invasive and non-destructive measurement techniques. Additionally, fluid velocity distributions, through samples of the resulting bed structures, are analysed using lattice boltzmann method （LBM） simulations and are compared against experimental data from the literature.

关键词： Packing algorithm Bed structure Packed columns Macroscopic properties lattice boltzmann simulations

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lattice boltzmann Modeling of Cholesteric Liquid Crystal Droplets Under an Oscillatory Electric Field

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Communications in Computational Physics 2023年第1期33卷 118-143页

作者： F.Fadda A.Lamura A.Tiribocchi Institute of Physics University of Amsterdam1098 XH AmsterdamThe Netherlands Department of Chemical Engineering Kyoto UniversityKyoto 615-8510Japan Dipartimento di Fisica and Sezione INFN Universit`a di BariVia Amendola 17370126 BariItaly Istituto Applicazioni Calcolo CNRVia Amendola 122/D70126 BariItaly Istituto Applicazioni Calcolo CNR via dei Taurini 1900185 RomeItaly

We numerically study the dynamics of quasi-two dimensional cholesteric liquid crystal droplets in the presence of a time-dependent electric field,rotating at constant angular velocity.A surfactant sitting at the droplet interface is also introduced to prevent droplet coalescence.The dynamics is modeled following a hybrid numerical approach,where a standard lattice boltzmann technique solves the Navier-Stokes equation and a finite difference scheme integrates the evolution equations of liquid crystal and surfactant.Our results show that,once the field is turned on,the liquid crystal rotates coherently triggering a concurrent orbital motion of both droplets around each other,an effect due to the momentum transfer to the surrounding fluid.In addition the topological defects,resulting from the conflict orientation of the liquid crystal within the drops,exhibit a chaotic-like motion in cholesterics with a high pitch,in contrast with a regular one occurring along circular trajectories observed in nematics drops.Such behavior is found to depend on magnitude and frequency of the applied field as well as on the anchoring of the liquid crystal at the droplet interface.These findings are quantitatively evaluated by measuring the angular velocity of fluid and drops for various frequencies of the applied field.

关键词： lattice boltzmann simulations liquid crystals non-Newtonian fluids

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