We are using Silver coated Hollow Glass spheres having a size of 10 microns. Since it is very expensive and we require a good amount of seeding, we are looking into the ways for making the particles in our laboratory itself. Can anyone suggest any reference which could be helpful?
Thanks in advance.
Yes. you can use Thermo cole spheres. We are trying to use this for our experimental study.
@Sridharan Thanks for the answer, but the diameter of the seeding particles should be comparable to the wavelength of the light source. In our case, for LASER output of 532 nm, the seeding particle range should be between 0.1 to 50 microns. So I think that thermocole spheres won't be of much help in our experiments.
You could use a edible oil as a seeding particle using low cost fog generator. One such fog generator is developed in Department of Aerospace Engineering, IIT Kanpur and a patent is also filed. It is used in the air. For water application, you may seek help from chemical engineers for the syntheses of silver nano particles.
Depends on your fluid under investigation. If you are using PIV for air, its easier to generate aerosols using edible oil. For water it is a challenge, since both the physical and optical properties need to be taken in account.
I am doing experiments with toluene as a fluid medium. I am having trouble with Polyamide seeding particles for PIV analysis (specific gravity=1.03) which gets deposited at the bottom during long run of experiments. The problem with toluene is that its density gets vary after every 10°C increase in temperature while density of seeding particles is always constant. I search about seeding particles for toluene-PIV in many papers but could not got any help. I am in search of best suited seeding particles for toluene PIV analysis.
The working specific gravity range required is : 0.876 to 0.810.
Any help regarding to this is most appreciated.
You probably don't need the silver coating. I was able to use Potter's Industries glass microspheres in a water/glycerol solution (1.06 g/cc) successfully and they were much cheaper than the coated sphere options from other suppliers. Below is a spec sheet for 110P8 which is what I used.
http://www.brenntag.com/media/documents/bsi/product_data_sheets/material_science/potters/sphericel_pds.pdf
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