Patent ID: 7905728

Claim:
A device for generating a visible vortex having a lower terminus for display or educational purposes, the device comprising: a substantially cylindrically shaped container having a lower end, an upper end, a diameter D and a longitudinal length L, the container housing a two-phase fluidic system comprising a first phase fluid and a second phase fluid; the first phase fluid comprising water; the second phase fluid comprising silicone fluid and having a specific gravity of between about 0.86-0.90 g/cm 3 ; the two-phase fluidic system further comprising an opacifying agent consisting essentially of polyethylene powder suspended in the silicone fluid, the powder having a specific gravity between 0.92 and 0.94 and a size range of between 300-400 microns; a rotatable, magnetic stir bar positioned proximate to the lower end of the container and controlled to maintain a speed of rotation S sufficient to swirl the two-phase fluidic system such that the silicone fluid forms a vortex having a length of between 80% L and 90% L and being visible within the water; the rotatable stir bar further being constructed and arranged so as to create sufficient turbulence while being rotated at the speed S such that the lower terminus of the vortex does not contact the stir bar; and the stir bar further being substantially elongated and having a length of about four times its width, and having end caps positioned over the ends of the stir bar to form a stir bar subassembly.