Alternative Design 2
This design, found on the Logisys LT80UVBL fan, is the simplest of all designs we saw, and we even question if it could be classified as fluid dynamic – in our opinion, it is a regular sleeve bearing. The only difference between this design and a regular sleeve bearing is the presence of two grooves alongside the exterior of the bearing. Differently from the alternative designs 1 and 3, the external groove is not connected to the ends of the bearing, so we wonder how the grooves would make the lubricant flow. The interior of the bearing is smooth.