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Abstract

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.

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1.
Funds:Project supported by the National Natural Science Foundation of China (Grant No. 60708014), and the Fundamental Research Funds for the Central Universities of Central South University, China (Grant No. 2013zzts153).

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Cited By

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Vol. 63, Issue 21 - 2014-11-05

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