The most popular rotors in lab centrifugation are actually swing-bucket or either fixed-angle rotors. Just a couple of uses demand special blades such as continuous-flow rotors, drum rotors, and the like. Flow-through rotors permit ongoing flow selection of precipitates. These units are used, e.g., in gathering fermenters or for juice development in the meals business. Look at this to get a full article about centrifugation.