Fluidic permeability measurement bridge

Measuring and testing – With fluid pressure – Porosity or permeability

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73 32R, 73 376, G01N 1508

Patent

active

046497382

ABSTRACT:
Physical properties relating to permeability and porosity of a material in a conveying fluid medium are determined in a device designed to measure the pressure differential between a first stream of fluid applied directly to the material in the medium and a second stream applied to a referencing plenum containing only the medium. The system is sensitive to the component of flow resistant imparted by the material itself without measuring the pressure drop across the entire thickness of material. The invention finds particular application in determining the permeability of cotton at various stages of the ginning operation for the ultimate purpose of monitoring and controlling the moisture content.

REFERENCES:
patent: 3218844 (1965-11-01), Kleist et al.
patent: 4311037 (1982-01-01), Gotchel et al.
patent: 4471649 (1984-09-01), Cronshaw
patent: 4495796 (1985-01-01), Hester et al.
patent: 4506542 (1985-03-01), Rose
A. H. Waldie et al., "Automatic Moisture Sensor for Measurement and Control of Cotton Ginning Processes", J. Eng. Indus. 105: 27-30 (Feb. 1983).

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