Abstract
We report on our attempt to reduce power consumption in hydraulic capsule transport, and as the first approach we examined the effect of polymer additives to reduce pipe friction. Measurements were carried out in a horizontal straight pipeline of about 28 m length with 40 mm inside diameter using capsules of different masses with wheels for different loading periods as well as different inlet pressure heads. Additives of 500 ppm solution were injected into the water flow from the pipe axis near the pipe inlet. The pipe friction coefficient λ was reduced to about 1/3 for Reynolds numbers of 104∼6.5×104. The capsule velocity was increased about 50% by the additives. Numerical solution by the method of characteristics is carried out by using an empirical pipe friction coefficient.
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