Terminal velocity in spray dryer

[elmariachi]

I am working on a problem involving spray dryers. The material to be dryed would be injected through a centrifugal disk with spherical multiple openings of about 0.5 mm in diameter. Hot air would be blown from the dryer's bottom part. I was wondering how can I approach the problem to find out the particle's terminal velocity. The wet material at somepoint in the dryer will fully or partly loose its water molecules. will it be affecting the terminal velocity too and how is terminal velocity related to reynolds number.any help will be appreciated.

thanks

 

[member 553083]

!The terminal velocity of a particle depends on the particle size, density, and shape, as well as the properties of the gas (or liquid) medium in which it is suspended. The Reynolds number is a dimensionless quantity that can be used to describe the motion of a particle relative to the surrounding medium and is related to the drag force on the particle. Thus, in order to calculate the terminal velocity of a particle in a spray dryer, you need to calculate both the drag force on the particle and the properties of the air in the dryer. Once you have these two pieces of information, you can use the equation for terminal velocity to calculate the velocity at which the particle will eventually settle.