LS-10 Remote Operation Liquid Droplet Seeder
Dantec Dynamics are acting
as agents for our liquid seeder. For details and pricing
please refer to the Dantec
Dynamics web page, model number 10E01.
APPLICATIONS
- Droplet Seeding for Particle Image Velocimetry
- Droplet Seeding for Laser Doppler Velocimetry
- Oil mist for flow visualisation
- Seeding for Mie Scattering combustion studies of flame shape
- Aerosol research
- Controlled oil mist for lubrication
SPECIFICATION
- Up to 10 bar working back-pressure.
- Ten Laskin nozzles.
- Approximate 108 particles/second. seed output per jet
- Stainless steel pressure vessel construction.
- Acrylic level indicator rated for 10bar max pressure.
- Dilution air: Variable through central tube.
- M6 tapped mounting holes compatible with NewportTM saddles.
- Quick re-fill operation without the need to stop experiment.
- 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.
-
Controllability of seeder can be customised to suit other user
requirements.
PRINCIPLE OF OPERATION
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 busting 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. In this device 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.
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.
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