Re: Flow Of Powder, Student
The best way to measure flowability is by shear cell testing. The shear cell measures the amount of shear required for a material under consolidation to flow. In addition, it can measure the wall friction that accompanies shear against a solid surface. There are several books on the subject, but a good web link is:
http://www.erpt.org/992Q/tard-00.htm
Basically, there are three types: Jenike, Schulze, and Peschl. Jenike's equipment is very operator dependent and takes a certain amount of skill to get valid results. The Schulze tester is more automated; however, due to its design, it is sometimes difficult to decouple the effects of wall friction from internal friction when the shearing takes place. The best instrument is offered by Peschl A link to his website is:
http://www.ipt-online.com/
Three sets of data are generated: internal friction, wall friction, and cohesive strength. From the data, one can determine (1) the size of the outlet required for reliable flow, and (2) the geometry, i.e., slope of the hopper, required for mass flow (where powder flows throughout the hopper rather than in a central channel which is the case for what's called funnel flow).
Good luck!
Greg ■
Flow of powder, student
Hello
I am a student Industrial ingenieer food in Belgium and I'm working for my final presentation work, a couple of weeks at Griffiths, a producent of seasonings and coatings in powder form.
The flowability of this powders is the most important subject of my research.
Now I have to find a better way for testing the flowability of the powders. Which methodes are available? Are there any new devices? Ofcourse preferring a healthy combination of accuracy, speed, low expenses and reproducability.
Also what are the parameters that influence the flowability of the powders. (during production, transport, when used by our clients, during storage).
You can always mail me at bwolput@griffithlaboratories.com
Thank you very very very much
a thankful student from Belgium... ■