Biological Systems Engineering, Department of


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Published in Transactions of the ASAE VOL. 38(4):1 157-1162. Copyright © 1995 American Society of Agricultural Engineers. Used by permission.


Design equations were developed for two auger configurations that for practical purposes generate uniform vertical flow of granular material through containers or boxes having a rectangular cross-section. Both configurations have uniform outside diameters so the simple geometry of the conventional U-trough housings could be used with these augers. One configuration had a uniform pitch for the auger flighting and decreasing inside diameter. The other had a uniform inside diameter and a decreasing pitch of the flighting with distance from the outlet end of the auger. Both configurations dramatically improved the uniformity of flow over the conventional auger. However, confidence intervals (α = 0.01)generally indicated that flows were significantly different from an "ideal" uniform flow along the length of the augers.