a ratio of up to 1:20.
A two-fluid nozzle differs from a pressure nozzle in that it is additionally supplied with air, continuously generating drops having a small mean drop diameter, compared with the pressure nozzle. The mean drop diameter is determined by the mass flow ratio of atomizing air to liquid in the nozzle and decreases with increasing atomizing air flow rate. The effective range of a drop is determined by the momentum of the atomizing air and the transfer of this momentum to an entire drop cluster. As with the pressure nozzle, 99% of the atomized amount of liquid are formed by drops whose diameters differ from one another by a ratio of up to 1:20.
The pulsating change in the mode of operation in the case ofthe hybrid nozzle can occur, depending on the pulsation frequency, between the pressure nozzle mode and a two-fluid mode or between different two-fluid modes which differ in terms of the flow rate of the atomizing air supplied.
The pulsating change in mode of operation if the supply of the hybrid nozzle with compressed air and liquid is constant over time is generated in the hybrid nozzle itself owing to periodic start-up phenomena (autopulsation).
The pulsation occurs at a frequency of preferably from 5 to 70 Hz, particularly preferably from 10 to 20 Hz. The frequency is determined by the ratio of the size of the first resonance chamber in the direction of flow, behind the point at which the liquid enters the first resonance chamber, to the size of the