Abstract
GREGORY1 has defined two types of flow in powder agglomerates; ‘stick and slip’ flow and free flow. It is well known that fine particles tend to stick and that larger particles flow more easily. Adding larger particles to a very fine powder is one method of causing it to flow2 Some experiments have been carried out with sand flowing under gravity through a circular orifice in an attempt to determine the particle size at the transition point from stick and slip flow to free flow.
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References
Gregory, S. A., J. App. Chem., 2, Supp. issue, S1–S7 (1952).
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Irani, R. R., and Callis, C. F., Particle Size: Measurement, Interpretation and Application, 11 (Wiley, 1963).
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Jenike, A. W., Utah Eng. Exp. Sta. Bull. No. 108; Bull. Univ. Utah, 52, No. 29, 156 (1961).
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SMALLEY, I. Flow-stick Transition in Powders. Nature 201, 173–174 (1964). https://doi.org/10.1038/201173a0
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DOI: https://doi.org/10.1038/201173a0
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