Provided is an ultrafine bubble generation device. A device 10 includes a rotary blower 31a, a rotary mixer 11, and a bubble shear filter 21. The rotary mixer 11 includes a hollow part 13 including a vertex X inside, an inflow hole 12 for introducing a fluid and a discharge hole 16. In an inner wall surface of the hollow part 13, a groove 14 having a spiral shape for the fluid introduced from the inflow hole 12 is provided, and the discharge hole 16 is provided away from the vertex X of the spiral shape on an axis of the spiral shape. The bubble shear filter 21 is provided with a hollow part inside, and includes an inflow hole 24 for introducing the fluid into the hollow part, and a discharge hole 26 for discharging the fluid. The hollow part is tubular, a plurality of plate-like thin plates 22 and 23 are arranged perpendicularly to a central axis of the hollow part such that the central axis passes through a center point of each circular plate, adjacent thin plates are provided with a plurality of openings and a plurality of pointed end portions, and a pointed end portion 25a and an opening 25b of the adjacent thin plates are arranged to face each other.

An ultrafine bubble generation device including a gas-liquid mixed fluid generator, a rotary mixer, and a bubble shear filter. The rotary mixer is provided with a hollow part including a vertex inside, including an inflow hole, wherein a groove having a spiral shape is provided in an inner wall surface of the hollow part. The bubble shear filter is provided with a hollow part inside, including an inflow hole for introducing the fluid into the hollow part, wherein the hollow part is tubular, and a plurality of circular plates are arranged perpendicularly to a central axis of the hollow part, and an opening of a type 1 of circular plate and a pointed end portion of a type 2 of circular plate adjacent to the type 1 of circular plate are arranged to face each other, and connected with a pipeline.

A mixer for insertion into a rotor of a centrifuge has a mixing trough and an obstacle device with at least one obstacle. The at least one obstacle is configured in order to influence the flow of a liquid present in the mixing trough. In response to a rotation of the rotor, with a specified incorporation of the mixer in a holder of the rotor, a spacing between at least one wall section of the mixing trough and the obstacle device is variable such that the liquid present in the mixing trough flows around the obstacle of the obstacle device.