Centrifugal separator having an improved flow and system comprising such a centrifugal separator

A centrifuge for separating intermixed particulate material of different specific gravity comprising:

• a centrifuge bowl having a base, a circumferential bowl wall surrounding a central axis and an open end substantially opposite of the base, said central axis (passing through the base, the circumferential bowl wall having an inner and outer surface, said inner surface comprising a plurality of annular recesses;
• a housing for accommodating the centrifuge bowl, said housing having a base located in the central axis and a circumferential housing wall surrounding the central axis;
• an inlet configured to allow entry of a slurry into the centrifuge bowl, preferably arranged substantially in parallel with the central axis;
• means for rotating the centrifuge bowl about the central axis;
• an upper portion of the housing wall is connected to an upper portion of the bowl wall, and the base of the centrifuge bowl is connected to the base of the housing thereby defining an annular cavity between the bowl wall and the housing wall;
• the annular cavity being fluidly connected to the plurality of annular recesses on the inner surface of the centrifuge bowl by a number of perforations in the bowl wall;
• a fluid inlet fluidly connected to the annular cavity, wherein a first portion of the inner surface of the centrifuge bowl comprising one or more recesses has an angle with respect to the central axis which is different than the angle of a second portion of the inner surface of the centrifuge bowl comprising one of more recesses;
• and
• wherein a number of perforations are provided in the circumferential bowl wall.