a rotary pulsation device having a body , at least one rotor and one or more stators , in which the increased efficiency of the device is effected through the presence of ultrasonic vibrations generated by the bulk vibration of the rotors , stators , or both , the generation of the vibrations is a function of a combination of one or more of : the clearance between the rotors and stators which can be adjusted ; turbulizing elements on the rotors , stators , or both ; incisions on the rotors ; slots in the rotors ; and choke channels for controlling and directing recirculated flow within the device .