Clarification on pneumatic conveying formulas
Clarification on pneumatic conveying formulas
(OP)
I was hoping someone here could help clarify some things that are used in calculating pressure drop for pneumatic conveying.
With regards to the formula on dispersed solids density, a book I have read (cannot remember which one as of now) formally defines it as (weight of solids in test section/volume of test section). Another book (also cannot remember which as of now) seems to imply that the formula is (mass of solids in test section/volume of test section). My question is which one is correct?
Another question is about Hinkle's relation that is used to find superficial gas velocity. Is it used only for dilute phase flow?
Would appreciate any help you could offer with these questions.
With regards to the formula on dispersed solids density, a book I have read (cannot remember which one as of now) formally defines it as (weight of solids in test section/volume of test section). Another book (also cannot remember which as of now) seems to imply that the formula is (mass of solids in test section/volume of test section). My question is which one is correct?
Another question is about Hinkle's relation that is used to find superficial gas velocity. Is it used only for dilute phase flow?
Would appreciate any help you could offer with these questions.





RE: Clarification on pneumatic conveying formulas
W = M*g (W = weight, M= mass, g= acceleration of gravity)
SI units:
[W]= Newtons = kg*(m/s^2)
[M]= kilogram = kg
[g]= m/s^2
The so called "engineering" or "technical" system uses:
Force Kg (kgf) which on Earth is the weight of a mass of 1 kg.
The Std or customary system is very confusing (lbm, lbf, poundal) and all that jazz.
Regarding your question #2... don't have the foggiest idea.
HTH
Saludos.
a.
RE: Clarification on pneumatic conveying formulas
Other equation is from a classical thesis done by Hinkle in 1953 (yes, it's that old). A bit difficult to write it out here. I can't obtain the thesis so I don't really know the conditions under which he obtained the formula.
Thanks for the help!
RE: Clarification on pneumatic conveying formulas
e.g. when using SI the pressure drop will be in N/m^2 or Pascal, when using the engineering system pressure drop will be in kgf/m^2 or kgf/cm^2
HTH
Saludos.
a.
RE: Clarification on pneumatic conveying formulas
I would appreciate if you could guide me on calculating the pressure drop across a pneumatic conveying line.
Thanks
arkhan
RE: Clarification on pneumatic conveying formulas
The calculation of pressure drop in pneumatic conveying lines is not so complicated for dilute phase conveying:
there are 4 main contributors:
-acceleration of solids (and fluid)
-friction along horizontal and vertical pipes
-bends
-vertical height
If you need more details about the formulas please let me know.
regards
Klaus Schneider
RE: Clarification on pneumatic conveying formulas
http://www.erpt.org/014Q/rhoe-00.htm
regards
Klaus Schneider