ASTM D7743-12 PDF

Scope: 1.1 This test method describes the apparatus and procedure needed for determining the minimum fluidization velocity of Geldart Group A powders and the minimum fluidization or complete fluidization velocity of Geldart Group B powders.

1.1.1 This test method is for powders that are readily or easily fluidizable and fall into the category of Group A and B of the ???Geldart??? classification. The fluidization of Geldart Group C powders will be addressed in another standard. This test method could apply to Geldart Group D particles but the focus of this document is towards Group and A and B materials.

1.1.2 Geldart classification of powders is often defined by comparing the Sauter mean particle size with the difference between the particle density and the density of the fluidizing gas, as illustrated in Fig. 1 (1).²
FIG. 1 Geldart Classification of Particles

1.1.2.1 Group A powders are easily fluid......

ASTM D7743-12 Referenced Document

ASTM D2216 Standard Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
ASTM D3195 Standard Practice for Rotameter Calibration
ASTM D3740 Standard Practice for Minimum Requirements for Agencies Engaged in the Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
ASTM D6026 Standard Practice for Using Significant Digits in Geotechnical Data
ASTM D653 Standard Terminology Relating to Soil, Rock, and Contained Fluids

2012 ASTM D7743-12 Standard Test Method for Measuring the Minimum Fluidization Velocities of Free Flowing Powders