# Bed fluidization + air blower

1. Oct 16, 2015

### coolnessitself

I'm looking to create a fluidization bed like in this video by putting an air blower under a cylinder of beads. For a given cylinder and particle type, I was looking into the flow velocity needed to make this happen.
I came across this (see the first section) which gives a numerical result for u, the minimum velocity required for fluidization, in the range that I'd expect.
I was initially somewhat surprised that the formula and result are independent of the height, equivalently the mass, of the particles in the cylinder. (Just in case, I derived this myself and also found a dissertation that experimentally confirms this for several geometries.) But I guess the result -- the minimum flow velocity V required for fluidization -- assumes the air blower is able to deliver that velocity, or at least deliver that flow rate Q = V * Area at the blower exit, which seems to be reported by air blower specs (in cubic feet per meter CFM)

So I suspect it has something to do with HP or Wattage of the blower. In other words, if I have a required flow velocity, a cross-sectional area, all the variables in the washu link plus height of the particles (or their mass and density), and a blower's spec'd flow rate (in CFM), how do determine if a blower will suffice? Some f(horsepower)?

2. Oct 22, 2015