Autor segons l'article: Bonet Avalos, J.; Colagrossi, A.; Durante, D.; Souto-Iglesias, A.
Departament: Enginyeria Química
Autor/s de la URV: BONET AVALOS, JOSÉ; Colagrossi, A.; Durante, D.; Souto-Iglesias, A.
Paraules clau: Fluid dynamics Hamiltonians Newtonian liquids
Resum: 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.
Grup de recerca: Molecular simulation II: Polymers and Interfaces
Àrees temàtiques: Enginyeria química Ingeniería química Chemical engineering
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1539-3755
Identificador de l'autor: 0000-0002-7339-9564; ; ;
Data d'alta del registre: 2018-02-13
Volum de revista: 96
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2017
Pàgina inicial: Art.num. 023101
Tipus de publicació: Article Artículo Article
Repositori URV