Bulk solids property tester

Measuring and testing – With fluid pressure – Porosity or permeability

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73794, G01N 300

Patent

active

047152125

ABSTRACT:
Apparatus and method for testing the internal friction and yield strength properties of bulk solids, for use in the design of material handling equipment. A sample of the solids is confined under controlled pressure in a test cell having an annular wall converging from one end of larger cross section downwardly toward a second end of smaller cross section. The pressure at the one end is varied until the ratio of the two pressures becomes constant. The two resulting pressures are then used together with the separately measured bulk density of the solids and the angle of friction thereof with the wall of the test cell to compute the effective angle of internal friction. By a further step including removal of the pressure applying means at the other end the unconfined yield strength may be determined.

REFERENCES:
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patent: 3478572 (1969-11-01), McRae et al.
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patent: 3593573 (1971-07-01), Ely
patent: 3975950 (1976-08-01), Erdei
patent: 4502338 (1985-03-01), Smith et al.
Article, Flow Properties of Bulk Solids (Jenike, Elsey and Woolley), proceedings of the American Society for Testing Materials, vol. 60, pp. 1168-1181.

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