Autor según el artículo: Bonet Avalos, J.; Colagrossi, A.; Durante, D.; Souto-Iglesias, A.

Departamento: Enginyeria Química

Autor/es de la URV: BONET AVALOS, JOSÉ; Colagrossi, A.; Durante, D.; Souto-Iglesias, A.

Palabras clave: Fluid dynamics Hamiltonians Newtonian liquids

Resumen: Stokes' hypothesis, the zeroing of the bulk viscosity in a Newtonian fluid, is discussed in this paper. To this aim, a continuum macroscopic fluid domain is initially modeled as a Hamiltonian system of discrete particles, for which the interparticle dissipative forces are required to be radial in order to conserve the angular momentum. The resulting system of particles is then reconverted to the continuum domain via the framework of the smoothed particle hydrodynamics (SPH) model. Since an SPH-consistent approximation of the Newtonian viscous term in the momentum equation incorporates interparticle radial as well as nonradial terms, it is postulated that the latter must be null. In the present work it is shown that this constraint implies that first and second viscosities are equal, resulting in a positive value for the bulk viscosity, in contradiction to the cited Stokes' hypothesis. Moreover, it is found that this postulate leads to bulk viscosity coefficients close to values found in the experimental literature for monoatomic gases and common liquids such as water.

Grupo de investigación: Molecular simulation II: Polymers and Interfaces

Áreas temáticas: Enginyeria química Ingeniería química Chemical engineering

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 1539-3755

Identificador del autor: 0000-0002-7339-9564; ; ;

Fecha de alta del registro: 2018-02-13

Volumen de revista: 96

Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion

Enlace a la fuente original: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.96.023101

DOI del artículo: 10.1103/PhysRevE.96.023101

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2017

Página inicial: Art.num. 023101

Tipo de publicación: Article Artículo Article