Material property effects on granular flow through orifices

C. B. Fedler, J. M. Gregory

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A relationship was developed to predict the flow resistance of granular materials as a function of the minimum length of the particle dimensions and surface roughness, eliminating the need for costly field calibration. The resistance term was found to be a linear function of the minimum particle dimension. The slope for the relationship was independent of surface roughness; however, the intercept varied with surface roughness. Without considering surface roughness effects on the intercept, the linear relationship predicted measured resistances with an R2 = 0.85. With the materials grouped into two types, smooth and rough, and individual intercept values determined for each group, the R2 values increased to 0.99 and 0.98 for Type I (smooth) and Type II (rough) materials, respectively.

Original languageEnglish
Pages (from-to)263-266
Number of pages4
JournalTransactions of the American Society of Agricultural Engineers
Issue number1
StatePublished - Jan 1989


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