FREMGANGSMAADE TIL NEDSAETTELSE AF TRYKFALDET I EN LEDNING, SOM TRANSPORTERER ET VISKOST, GNIDNINGSTABFORMINDSKENDE MATERIALE

摘要

Method for reducing pressure drop in a conduit carrying a viscous drag reducing material by injecting a lower viscosity liquid which is immiscible with the drag reducing material at the periphery of the conduit to form a flowing annular layer of such lower viscosity liquid thereby reducing the pressure drop in the conduit.