Downloads - DOCUMENTS on powder testing and hoppER DESIGN
Using Fundamental Properties to Optimize Powder Flowability was published in Tablets & Capsules and explains how formulators can use shear cell and permeability test results to ensure that their blends will reliably flow in bins and hoppers.
Using Solids Flow Properties to Design Mass- and Funnel-Flow Hoppers was published in Powder and Bulk Solids. It's similar to the T&C article, but it includes a funnel flow bin example.
URI Notes is an up-to-date pdf of my book Storage and Flow of Bulk Solids, and I update it regular.y for clarity, brevity, and levity. I use it in the powder handling course that I give at the University of Rhode Island. It requires a password to open because I offer the textbook on my home page. An abridged version of my book does not require a password. You can also download the Excel workbooks that I use to design bins or predict flow behavior in existing bins.
The concepts are straightforward, but the analysis can be painful because the equations are serpentine, and the calculations are iterative. The compressed file named Hopper Design Files contains the Excel files that I use to analyze shear cell and permeability test results to predict powder flow behavior or design bins. The hopper design workbook has some nice VBA-driven macros that walk the user through Jenike's methods.
I modified Jerry Johanson's solids discharge rate equation so that it can be used with fine powders. I am vainly calling it the Mehos-Johnson Equation.
I periodically add other documents on powder handling and processing. Be sure to visit and check for updates.