Standard Guide for Theory and Principles for Obtaining Reliable and Accurate Bulk Solids Flow Data Using a Direct Shear Cell

Importancia y uso:

5.1 A large number of industrial processes involve transfer and feeding of bulk solids, and the ability of such materials to flow in a controlled manner during these operations is critical to product quality.

5.2 Direct shear cells are among the most important methods for measuring the flow properties of bulk solids in industrial applications for bulk solids handling.

5.3 Direct shear cells have many advantages over simpler methods of measuring bulk solids flow properties, but their operation is more complex and the procedures for their use must be carefully controlled to produce accurate and reproducible data.

5.4 The three most popular direct shear cell types are: Translational (D6128), Annular (D6773), and Rotational (D6682 and D7891).

5.5 From shear cell data, a wide variety of parameters can be obtained, including the yield locus representing the shear stress to normal stress relationship at incipient flow, angle of internal friction, unconfined yield strength, cohesion, and a variety of related parameters such as the flow function.

5.6 In addition, these three direct shear cells can be set up with wall coupons to measure wall friction.

5.7 When the shear cell data are combined with unconfined yield strength, wall friction data, and bulk density data, they can be used for bin and hopper evaluation and design.

Subcomité:

D18.24

Referida por:

F3702-25, F3509-25, D0653-24A

Volúmen:

04.09

Número ICS:

19.060 (Mechanical testing)

Palabras clave:

annular shear tester; bulk solid; cohesive strength; flow function; Freeman Technology FT4 Powder Rheometer Shear Cell; internal friction angle; Jenike shear cell; kinematic wall friction angle; Peschl Rotational Split Level Shear Tester; powder; rotational shear tester; Schulze Ring Shear Tester; translational shear tester; unconfined yield strength; wall friction; yield locus;