Abstract
This work discusses the classical problem of effective viscosity of a Newtonian fluid with rigid spherical particles. It argues that the simple non-interaction approximation when formulated correctly yields an effective viscosity ratio for the suspension in the form μ/ μ 0 = (1 − 2.5 ϕ) −1 that remains accurate at much higher volume fractions of particles ϕ than the usual first-order approximation μ/ μ 0 = 1 + 2.5 ϕ.
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