Tangential flow separator element incorporating flow obstacles, and method of fabrication

A monolithic tangential flow separator element for separating a fluid medium for treatment into a filtrate and a retentate, said separator element comprising a rectilinear rigid porous support of three-dimensional structure having arranged therein at least one channel having a wall that is continuously covered by at least one filter separator layer for passing a flow of a fluid medium for treatment in order to recover a filtrate from the outside surface of the porous support, the outside surface of the porous support presenting a profile that is constant, such that all outside generator lines parallel to a central axis of the porous support are straight lines that are parallel to each other,

• wherein the porous support includes obstacles to the flow of the fluid for filtering on or in the inside wall(s) of the channel(s), the obstacles having identity of material and of porous texture with the porous support and having continuity of material and of porous texture with the porous support, such that the obstacles form an integral portion of the porous support, wherein the obstacles, by appearing between first and second positions taken along the longitudinal axis of the channel, generate a sudden narrowing or a converging nozzle in the flow direction of the fluid for treatment in said channel in order to impede or disturb the flow of the fluid,
• wherein the sudden narrowing presents a radial wall that extends perpendicularly to the longitudinal axis, and
• wherein said converging nozzle presents a wall that slopes relative to the longitudinal axis at an angle α that is greater than 0° and less than 90°.