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The dynamics of elastic dumbbells in linear shear flow is investigated byfluid particle dynamics simulations at small Reynolds numbers. The positivecontribution of a single dumbbell to the effective shear viscosity isdetermined via the extra stress exerted at the boundaries of the shear cell andthe difference to the contributions obtained via the Kramers-Kirkwood formulaare described. For a small Weissenberg number and when the mean dumbbell lengthbecomes larger than the mean next-neighbor distance, the contribution ofinteracting dumbbells to the mean shear viscosity exceeds significantly thecontribution of unconnected beads occupying the same volume fraction.

Dumbbells in suspension: A numerical study on their dynamics and shear viscosity