Patent ID: 8869320

Claim:
A spa nozzle for use underwater, comprising: a water supply and an air supply, and a fluidic oscillator for oscillating a jet of water back and forth, said fluidic oscillator having an interaction region and a pair of control ports at the upstream end of said interaction region and a power nozzle connected to said water supply for projecting a jet of water into said interaction region, a pair of feedback passages connecting said control ports with a downstream end of said interaction region, and said interaction region having an outlet aperture, said power nozzle and said outlet aperture having a width and a depth, said interaction region having sidewalls that diverge from said power nozzle and converge to said outlet aperture and a top and a bottom wall, and said spa nozzle further including additional diverging sidewalls extending downstream of said outlet aperture for issuing a sweeping jet of water into a spa, wherein said power nozzle generates a jet of water that expands in the interaction region allowing an oscillation of said jet to develop, wherein an air entrainment port is formed in each of said diverging side walls downstream of said outlet aperture of said interaction region, and wherein said oscillating jet of water causes low pressure regions to alternately develop as said jet alternatingly moves away from said air entrainment ports to cause air from said air entrainment ports to be alternately entrained by said jet of water as said jet of water oscillates between said diverging sidewalls downstream of said outlet aperture of said interaction region.