Verfahren und Vorrichtungen zur Herstellung gleich großer Tropfen

摘要

The invention relates to a method and devices for producing monodispersed drops using a two-component nozzle. The devices are each comprised of a pre-chamber (1) into which at least one nozzle (2) for a liquid medium and at least one inlet channel (3) for a gaseous medium discharge. According to the invention, the aim of the invention is accomplished in that a laminar liquid jet stream exiting a nozzle through a gas stream in a pre-chamber is elongated due to the applied pressure and flows together with the gas out of said pre-chamber via an opening, whereby the gas or the liquid is periodically oscillated. The formation of satellite drops, which is normally observed during Rayleigh jet breakup, does not occur at all due to the superposition of periodic oscillations. The frequency of the periodic oscillation ranges from 0.7 < fT < 1.3 of the natural breakup frequency of the elongated liquid jet. Drop sizes which are distinctly smaller than the diameter of the nozzle can be achieved due to the extreme elongation of the jet. In the extreme case, values from 1 to 10 were measured. The inventive method is thus additionally suited for suspensions which tend to quickly clog nozzles having small outlet diameters.