A disposable blood separation set of a centrifugal blood processing system comprising a blood processing chamber adapted to be mounted on a rotor of a centrifuge; a frustro-conical cell separation chamber in fluid communication with the processing chamber, the cell separation chamber having a protruding inlet therein. The protruding inlet may have a frustro-conical inner surface that slants radially outwardly from an inlet to a mouth of the protruding inlet. A circumferential well may surround the protruding inlet. The cell separation chamber may have a baffle within a separation area. The baffle may have a plurality of vanes with openings therein.