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Description:

Rotating-drum tests are widely employed for the characterization of powder flowability
through image-derived free-surface observables. However, the statistical stability of the
selected observable is rarely examined, although it directly determines the number of
images required for reliable evaluation. In the present study, two observables obtained
from rotating-drum tests of a cohesive metal powder are compared: the dynamic angle of
repose (AoR) and a contour-length-based index, R, derived from the extracted free-surface
contour.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: rotating drum, cohesive powder, dynamic angle of repose, image-derived observable, statistical variability

Date published: 2026-07-21

Publisher: MDPI AG

Journal:

• Powders (ISSN: 26740516) vol. 5 issue. 3 27

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/powders5030027

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Updated at: 2026-08-07 08:49:16 +0900

Published on MDR: 2026-08-07 10:28:53 +0900