Abstract: Drag in turbulent aqueous streams is reduced by a powder composition of a finely divided hygroscopic drag reducing powder, for example poly(ethylene oxide), and a colloidal size hydrophobic powder, for example, an organosilicon modified colloidal silica, and an inert filler such as sodium sulphate. The powder composition is injected into the turbulent stream by first mixing the powder with water to form a slurry and immediately thereafter drawing the slurry through an eductor into a recycle stream between the downstream and upstream ends of a pump for the turbulent stream.

Abstract: An apparatus to inject fine hygroscopic powder into a high pressure stream has a dispenser which dispenses powder onto a flared dispersing surface mounted in a mixing receptacle. The flared dispersing surface disperses the powder and deposits the powder onto a collector portion of the mixing receptacle. A water supply means creates a film of water on the collector portion to mix the powder and water. An outlet on the bottom of the mixing receptacle is coupled to a high pressure stream through a venturi orifice to draw the mixture into a high pressure stream.