average particle size
average particle size
(OP)
Hello
For the vessel shown in the attachment, size of the particles is different and the liquid entry is from the bottom. I want to calculate the minimum fluidization velocity from Ergun equation. To estimate the average particle diameter, I doubt the use of sauter mean diameter. Can I use the mass mean diameter? I appreciate the forum's suggestion in this problem.
Thanks,
For the vessel shown in the attachment, size of the particles is different and the liquid entry is from the bottom. I want to calculate the minimum fluidization velocity from Ergun equation. To estimate the average particle diameter, I doubt the use of sauter mean diameter. Can I use the mass mean diameter? I appreciate the forum's suggestion in this problem.
Thanks,





RE: average particle size
2. In practice, we use average diameter(a rough number), but the best number would be "sauter mass mean diameter".
RE: average particle size
Ergun equation is for pressure drop in packed beds. But the equation can be rearranged.
DP/L = g*(1-e)*(density of particle - density of liquid). where e is the voidage.
There are layers of particles, each with different diameter. ( I mean its not a mixture )In this case can I go ahead with sauter mass mean diameter?