An apparatus for converting rotation into fluid flow, comprising: a first fluid conduit extending from a first open end to a second open end of the first fluid conduit, said first fluid conduit being coiled around a first axis of rotation in a first angular direction; a second fluid conduit extending from a first open end to a second open end of the second fluid conduit, said second fluid conduit being coiled around said first axis of rotation in a second angular direction opposite to said first angular direction; a rotor coupled to said first fluid conduit in such a way that rotation of said rotor causes said first fluid conduit to rotate around said first axis of rotation; a first fluid separator for separating said first fluid from a second fluid having a second density different from said first density, said first fluid separator being in fluid flow communication with the second open end of said first fluid conduit, and in fluid flow communication with the first open end of said second fluid conduit; and an outlet allowing extraction of said first fluid from said first fluid separator, wherein said first fluid separator is configured in such a way that when, during rotation of said rotor in a first direction of rotation, first mass portions of said first fluid and second mass portions of said second fluid are alternatingly transported from the first open end towards the second open end of said first fluid conduit, third mass portions of said first fluid and fourth mass portions of said second fluid are alternatingly transported from the first open end towards the second open end of the second fluid conduit, wherein a ratio between each of said first mass portions and each of said second mass portions is greater than a ratio between each of said third mass portions and each of said fourth mass portions. a first fluid conduit extending from a first open end to a second open end of the first fluid conduit, said first fluid conduit being coiled around a first axis of rotation in a first angular direction; a second fluid conduit extending from a first open end to a second open end of the second fluid conduit, said second fluid conduit being coiled around said first axis of rotation in a second angular direction opposite to said first angular direction; a rotor coupled to said first fluid conduit in such a way that rotation of said rotor causes said first fluid conduit to rotate around said first axis of rotation; a first fluid separator for separating said first fluid from a second fluid having a second density different from said first density, said first fluid separator being in fluid flow communication with the second open end of said first fluid conduit, and in fluid flow communication with the first open end of said second fluid conduit; and an outlet allowing extraction of said first fluid from said first fluid separator, wherein said first fluid separator is configured in such a way that when, during rotation of said rotor in a first direction of rotation, first mass portions of said first fluid and second mass portions of said second fluid are alternatingly transported from the first open end towards the second open end of said first fluid conduit, third mass portions of said first fluid and fourth mass portions of said second fluid are alternatingly transported from the first open end towards the second open end of the second fluid conduit, wherein a ratio between each of said first mass portions and each of said second mass portions is greater than a ratio between each of said third mass portions and each of said fourth mass portions.