Open AccessStudy on diffusion of permeable particles in concentrated suspensions
Author(s) -
Yang Wei-guo,
Cheng Zhong,
Hui Xia
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.214705
Subject(s) - volume fraction , thermal diffusivity , radius , materials science , permeability (electromagnetism) , diffusion , critical radius , penetration (warfare) , thermodynamics , particle (ecology) , mechanics , physics , spheres , chemistry , membrane , composite material , computer security , computer science , biochemistry , oceanography , operations research , astronomy , engineering , geology
We have studied the effective diffusion coefficient of permeable particles with different radii at different permeability and volume fractions by using the numerical simulation results of short-time diffusion dynamics of permeable particles in concentrated suspensions and the combination of Cohen-de Schepper and Percus-Yevick approximations. As a result, the diffusivity of particles having the same radius will increase monotonically with increasing permeability to a certain volume fraction, and decrease linearly with increasing volume fraction to a certain permeability. While the effect of particle radius on the measured effective diffusion coefficients for the permeable particles with larger wave-numbers at the same ratio of particle radius to the hydrodynamic penetration depth may be neglected.