Patent ID: 8272716

Claim:
A method of ejecting a composite liquid jet from a nozzle, the method comprising providing a nozzle and a liquid, the nozzle including a wall, the nozzle being provided with an internal structure located upstream relative to the nozzle that separates a flow of the liquid comprising two phases, one phase being an active phase containing one or more components, the other phase being a continuous phase in which one or more of the active components is not present, the two phases being separated such that the liquid that flows within a boundary layer of the nozzle wall is substantially comprised of the continuous phase, the active phase being substantially excluded from the boundary layer, wherein the boundary layer has a thickness δ defined by δ = μ ⁢ ⁢ x ρ ⁢ ⁢ U wherein μ is the continuous phase viscosity in Pa·s, U is the jet velocity in m/s ρ is the continuous phase density in kg/m3 and x is the length of the nozzle in m in the direction of flow; and pressurizing the liquid to cause a composite jet of the liquid to be ejected from the nozzle, the composite liquid jet including the active phase and the continuous phase.