Products - Liquid Particle Generators - PLG Series

PLG Series - Laskin type nozzle liquid aerosol generators

The PLG Series is based around the well known Laskin nozzle process, where a compressed air flow through a submerged nozzle arrangement is used to create a high concentration of small liquid droplets in an polydisperse aerosol. The original principle and design dates back to 1948 and S. Laskin's ‘Submerged Aerosol Unit’ report while at the University of Rochester.

The basic principle remains, but modification to the systems over the interviening years have improved the performance of the aerosol generators developed around the principle. The PLG range has been developed in three different base formats to allow generation over a range of particle sizes including with a sub-micron mean number concentration and mass flows typically with oils such as DEHS, motor oils and other lubricants.

Addition of a heating control for the systems allows the viscosity of the fluid to be varied and therefore allows the user to tune the output to their requirements and can also maintain stability and repeatability of the aerosol generated when the ambient temperatures may vary.

To allow longer test runs an automatic refill system can also be added.

PLG 2000 series is available in 4 models and gives the smallest particle size at 20g/hr mass flow. PLG 2010 adds heating (to 100°C) with the PLG 2010 S adding automatic refill. The PLG 2030 is a higher precision version of the PLG 2010.

PLG 2100 series is available in 2 models with medium output of 100 g/h at a larger mean diameter and are both heatable (to 120°C).

PLG 2300 series is again available in 2 models with high output of 300 g/h at the same mean diameter and are heatable (to 80°C).

The Laskin Nozzle PrincipleLaskin Nozzle

Compressed air if fed down a supply tube to four radial holes. Just above these holes a ring is secured with four adjacent holes above the air exits.

Laskin Nozzle plan viewThe nozzle arrangement is immersed in the fluid to be nebulised. As the compressed air flows at high velocity out of the radial holes, oil is drawn in to the airflow and effectively atomised into the small air bubbles created, which then grow and move to the surface of the liquid where they burst, therefore releasing the generated particles they contain into the air above the liquid.

The process is quite agressive and aerosols with mean particle diameters in the range of 0.4 - 1.5 can be generated. To create larger mass flows multiple nozzles are required.