Laskin nozzle

A Laskin nozzle is a technical atomizer with the help of which fine droplet aerosols can be generated. The construction of the atomizer goes back to S. Laskin.

construction

A Laskin nozzle consists of a nozzle tube (approx. 10 mm diameter) with four radially arranged holes (air jet holes , approx. 1 mm diameter) perpendicular to the nozzle tube axis. The lower end of the nozzle tube is closed. Above the air jet holes there is a collar ring (approx. 16 mm outer diameter) with four holes (approx. 2 mm diameter), which run along the nozzle tube and are positioned approx. 0.5 mm above the air jet holes.

The nozzle pipe is positioned with the closed pipe end including air jet bores and collar ring in a container provided with the fluid to be dispersed (e.g. DEHS, DOP , motor oil), with a minimum distance of 25 mm between the underside of the nozzle pipe and the container bottom as well should be observed between the air jet bores to the liquid surface.

functionality

Compressed air is applied to the upper end of the nozzle tube. The air leaves the radial bores at high speed and thereby pulls liquid with it through the bores in the collar ring. As a result, the liquid is finely atomized in the gas bubbles formed. The bubbles then grow and move towards the surface of the liquid, where they burst and the finely distributed liquid droplets they contain are transferred into the airborne state.

The Laskin nozzle can only be operated when it is submerged.

In order to generate highly concentrated aerosols, several Laskin nozzles are usually operated in parallel.

application

Laskin nozzles are used as aerosol generators for filter test systems or in aerosol research. Because of the gentle way in which aerosols are generated, Laskin nozzles are also used to produce test aerosols to investigate the effects of bioaerosols .

Individual evidence

^ S. Laskin: Submerged Aerosol Unit , AEC Project Quarterly Report UR-38, University of Rochester, 1948.
↑ W.-H. Echols, J.-A. Young: Studies of air-operated aerosol generators , NRL interim Rep. 5929, US Naval Research Laboratory, Washington, 1963 ( PDF ).
↑ C. Tropea, A. Yarin, JF Foss: Springer Handbook of Experimental Fluid Mechanics , Springer Verlag, Berlin-Heidelberg, pp. 293-294, 2007.
↑ VDI 3491 sheet 2: 2017-01 measurement of particles; Manufacturing process for test aerosols; Dispersion of liquids (Measurement of particles; Methods for generating test aerosols; Dispersing liquids). Beuth Verlag, Berlin, p. 10.
↑ VDI 4258 sheet 1: 2017-03 Bioaerosols and biological agents; Production of test bioaerosols; Basics and requirements for test bioaerosols (Bioaerosols and biological agents; Generation of test bioaerosols; Basics and requirements for test bioaerosols). Beuth Verlag, Berlin, p. 17.

[1] S. Laskin: Submerged Aerosol Unit , AEC Project Quarterly Report UR-38, University of Rochester, 1948.

[2] W.-H. Echols, J.-A. Young: Studies of air-operated aerosol generators , NRL interim Rep. 5929, US Naval Research Laboratory, Washington, 1963 ( PDF ).

[3] C. Tropea, A. Yarin, JF Foss: Springer Handbook of Experimental Fluid Mechanics , Springer Verlag, Berlin-Heidelberg, pp. 293-294, 2007.

[4] VDI 3491 sheet 2: 2017-01 measurement of particles; Manufacturing process for test aerosols; Dispersion of liquids (Measurement of particles; Methods for generating test aerosols; Dispersing liquids). Beuth Verlag, Berlin, p. 10.

[5] VDI 4258 sheet 1: 2017-03 Bioaerosols and biological agents; Production of test bioaerosols; Basics and requirements for test bioaerosols (Bioaerosols and biological agents; Generation of test bioaerosols; Basics and requirements for test bioaerosols). Beuth Verlag, Berlin, p. 17.