title: Lattice Boltzmann method for mixtures at variable Schmidt number.
abstract: When simulating multicomponent mixtures via the Lattice Boltzmann Method, it is desirable to control the mutual diffusivity between species while maintaining the viscosity of the solution fixed. This goal is herein achieved by a modification of the multicomponent Bhatnagar-Gross-Krook evolution equations by introducing two different timescales for mass and momentum diffusion. Diffusivity is thus controlled by an effective drag force acting between species. Numerical simulations confirm the accuracy of the method for neutral binary and charged ternary mixtures in bulk conditions. The simulation of a charged mixture in a charged slit channel show that the conductivity and electro-osmotic mobility exhibit a departure from the Helmholtz-Smoluchowski prediction at high diffusivity.
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto di Chimica del Riconoscimento Molecolare (ICRM-CNR), Via Mario Bianco, 20131 Milan, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: Monteferrante
authors.affiliation: Istituto Processi Chimico-Fisici, Consiglio Nazionale delle Ricerche, Dipartimento di Fisica, Università La Sapienza, P.le A. Moro 2, 00185, Rome, Italy.
authors.forename: Simone
authors.initials: S
authors.lastname: Melchionna
authors.affiliation: Scuola di Scienze e Tecnologie, Università di Camerino, Via Madonna delle Carceri, 62032, Camerino, INFN Perugia, Italy.
authors.forename: Umberto Marini Bettolo
authors.initials: UM
authors.lastname: Marconi
mesh_terms: D004058:Diffusion; D053841:Electroosmosis; D057446:Hydrodynamics; D007700:Kinetics; D008956:Models, Chemical; D010316:Particle Size; D012212:Rheology; D012996:Solutions / Q000737:chemistry*; D014783:Viscosity
chemical_list: D012996:Solutions