title: Effective surface viscosities of a particle-laden fluid interface.
abstract: The Einstein formula for the effective shear viscosity of low Reynolds number suspension flows is generalized to the case of flat, low-concentration, particle-laden interfaces separating two immiscible fluids. The effective surface shear and dilational viscosities of this system is found to be eta{s}=5/3(eta{1}+eta{2})R phi and zeta{s}=5(eta_{1}+eta_{2})R phi , correspondingly, where eta{1} and eta{2} are the shear viscosities of two bulk fluids and phi is the surface concentration of spherical particles of radius R . The formula is found to be in excellent agreement with data obtained using multicomponent lattice Boltzmann equation simulation.
authors: Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK.
authors: S V
authors: SV
authors: Lishchuk
authors: I
authors: I
authors: Halliday