This paper considers interstitial fluid pressure as an additional characteristic effecting bulk solids flowability. It describes a method for improving flow control of cement, powdered coal, sand, etc. through a converging hopper by applying particle stress-ratio control. In some applications, flowability of bulk solids can be modified rather than make costly modifications to the hopper. The patented method combines a baffle, a slot opening and gas pressure control modifying flowability in a converging channel. Plug-flow, a preferred type of mass flow, has been achieved flowing cement through hoppers open to the atmosphere as well as through enclosed, pressurized hoppers.
Plug Flow of Bulk Solids Using Gas Pressure Control
R. B. Emery
Sun Petroleum Products Company, Duncan, Okla.
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Emery, R. B. (February 1, 1979). "Plug Flow of Bulk Solids Using Gas Pressure Control." ASME. J. Eng. Ind. February 1979; 101(1): 85–89. doi: https://doi.org/10.1115/1.3439479
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