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The motion of colloids in the flow field of a viscous liquid is investigated.The small colloid size compare to the macroscopical scale of the flow allow tocalculate their velocity relative to that of the liquid. If the inner colloiddensity is larger then the density of the liquid the flow field has the domainswhere the colloid velocity is close to the liquid velocity. But in the domainswith a strong braking of the liquid velocity the colloids are acceleratedrelative to the liquid. This effect is used for the qualitative explanation ofthe drag reduction in the flow around macroscopical bodies and in the pipes.

The flow around a macroscopical body by a colloid solution and the drag crisis