Torsional rheometer for granular materials slurries and gas-solid mixtures and related methods
Abstract
A torsional rheometer apparatus for determining rheological properties of a specimen is provided. A stationary plate and a rotatable plate are in generally coaxial position and structured to receive a specimen there between. In one embodiment, at least one of the plates and preferably both have roughened specimen engaging surfaces to serve to reduce undesired slippage between the plate and the specimen. A motor is provided to rotate the rotatable plate and a transducer for monitoring forces applied to the stationary plate and generating output signals to a computer which determines the desired rheological properties are provided. In one embodiment, the roughened surfaces consist of projections extending toward the specimen. Where granular material is being evaluated, it is preferred that the roughness of the plate is generally equal to the average size of the granular material being processed. In another embodiment, an air-solid mixture is processed and the roughened portions are pore openings in the plates. Air flows through the region between the two pore containing plates to maintain the solid materials in suspension. In yet another embodiment, the base of the stationary plate is provided with a deformable capacitance sensor and associated electronic means. 17 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Viscoustech, Inc
- OSTI Identifier:
- 445700
- Patent Number(s):
- 5610325
- Application Number:
- PAN: 8-464,325
- Assignee:
- Viscoustech, Inc., Pittsburgh, PA (United States)
- DOE Contract Number:
- FG02-92ER81429
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 11 Mar 1997
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; RHEOLOGY; MEASURING INSTRUMENTS; DESIGN; DISPERSIONS; OPERATION; GRANULAR MATERIALS; TWO-PHASE FLOW
Citation Formats
Rajagopal, C, Rajagopal, K R, and Yalamanchili, R C. Torsional rheometer for granular materials slurries and gas-solid mixtures and related methods. United States: N. p., 1997.
Web.
Rajagopal, C, Rajagopal, K R, & Yalamanchili, R C. Torsional rheometer for granular materials slurries and gas-solid mixtures and related methods. United States.
Rajagopal, C, Rajagopal, K R, and Yalamanchili, R C. Tue .
"Torsional rheometer for granular materials slurries and gas-solid mixtures and related methods". United States.
@article{osti_445700,
title = {Torsional rheometer for granular materials slurries and gas-solid mixtures and related methods},
author = {Rajagopal, C and Rajagopal, K R and Yalamanchili, R C},
abstractNote = {A torsional rheometer apparatus for determining rheological properties of a specimen is provided. A stationary plate and a rotatable plate are in generally coaxial position and structured to receive a specimen there between. In one embodiment, at least one of the plates and preferably both have roughened specimen engaging surfaces to serve to reduce undesired slippage between the plate and the specimen. A motor is provided to rotate the rotatable plate and a transducer for monitoring forces applied to the stationary plate and generating output signals to a computer which determines the desired rheological properties are provided. In one embodiment, the roughened surfaces consist of projections extending toward the specimen. Where granular material is being evaluated, it is preferred that the roughness of the plate is generally equal to the average size of the granular material being processed. In another embodiment, an air-solid mixture is processed and the roughened portions are pore openings in the plates. Air flows through the region between the two pore containing plates to maintain the solid materials in suspension. In yet another embodiment, the base of the stationary plate is provided with a deformable capacitance sensor and associated electronic means. 17 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 11 00:00:00 EST 1997},
month = {Tue Mar 11 00:00:00 EST 1997}
}