10F02 - Liquid Seeding Generator Brochure

Liquid Seeder, 10 Bar Back pressure Seeding Generator for LDA and PIVIntroduction This seeding generator produces droplets ideal for PIV and LDA measurements. It is the preferred solution for small to medium size facilities, and where remote control is required. Ten identical Laskin nozzles at the base of the device can be operated independently to give an easily controlled and repeatable seed density. Further dilution of the seed is made possible by means of an additional dilution jet that bypasses the liquid and mixes with the emerging mist. Description The individual Laskin nozzles operate close to sonic conditions at typical air supply pressures. The high shear region between the emerging air and liquid atomises and entrains microscopic liquid droplets into bubbles which release the seed on bursting at the free surface. Bubble bursting is a source of secondary atomisation that gives larger droplets, which are prevented from exiting the seeder by the horizontal baffle plate at the top of the device Applications • Droplet Seeding for Particle Image Velocimetry • Droplet Seeding for Laser Doppler Anemometry • Oil mist for flow visualisation Features • Up to 10 bar working back-pressure • Ten Laskin nozzles • Remote Control Panel • Quick re-fill operation without the need to stop experiment Liquid Seeder, 10 Bar Back Pressure Product Information Specifications ? Up to 10 bar working back-pressure ? Ten Laskin nozzles ? Approximate 108 particles/second seed output per jet ? Particle size range : 1-3 µm ? Stainless steel pressure vessel construction. ? Acrylic level indicator rated for 10 bar max pressure. ? Dilution air : Variable through central tube ? Remote Panel : Pneumatically operate any number of nozzles (1-10) to control seed density remotely from the experiment. Compatible with solenoid valves for PLC or computer control. ? Push-fit pipe connectors and colour coded air tubes for easy installation and adjustment of remote cable length. ? One way valves on all Laskin nozzles to avoid contamination of air supply pipes with seeding liquid. ? M6 tapped mounting holes ? Quick re-fill operation without the need to stop experiment Recommended working liquids Typical seed materials include corn oil, olive oil, and silicone fluids (eg Dow Corning). Corn oil is frequently used in wind tunnel applications at atmospheric pressures and temperatures, as it is inexpensive and produces micron-sized droplets. Olive oil has a higher flash point or decomposition temperature, and is the liquid of choice for many internal combustion engine flows. Where operation at very high temperatures, and reduced pressures is required, silicone vacuum fluids are preferred. These liquids were developed for use in vacuum diffusion pumps and combine very low vapour pressure with high flash points and surface tension and kinematic viscosities similar to the vegetable oils. It is also possible to use this seeder to provide solid particle seeding by diluting powders with water or methanol. Additional information For additional information please contact your Dantec Dynamics representative in your country. Please find a list of current representatives on Dantec Dynamics’ web site (www.dantecdynamics.com) Ordering information Model Description 9010F0021 Liquid seeder, 10 bar back pressure, remote control Dantec Dynamics undertakes a continuous and intensive product development programme to ensure that its instruments perform to the highest technical standards. As a result the specifications in this document are subject to change without notice. Publication No.: pi_128_v8 www.dantecdynamics.com