Is there any relation between type of nozzle used and particle size, its distribution, bulk density (BD) of the spray dried material? How does feeding pressure and hot air temperature affect the BD of the material?
1) Type of nozzle affect particle size depending of the droplet size the nozzle is producing, which is also affected by the feeding pressure.
2) Feeding pressure affects also: the higher is the pressure, smaller is the droplet and therefore smaller is the particle size of the dried material.
3) Air temperature affects because the drying time decreases as the temperature increases.
4) Bulk density is mainly determined by particle size that depends on the factors already mentioned; nozzle type, air pressure, air temperature, how concentrated is the departing solution... etc.
I hope this will help you. Best regards.
Very good answer Luis. The following information may not be relevant to your application but anyway.
In work I carried out I found that increased bulk density (and smaller particle size) decreased flow ability in powder and vice versa.
The effect of drying temperature on the bulk density of the spray dried powder is controversial.
This is due to the drying kinetics and solid content. Particles can dry by shrinking or as hollow spheres. This mainly depends on the initial solid content. A rapid formation of a skin fosters hollow spheres, as long as the steam pressure inside the sphere is not blowing holes into the already formed skin.
=>for equal droplet sizes a high solid content and drying at moderate air temperatures usually gives lower bulk densities.
I think this will help you..
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