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Title: 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):
5,610,325
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 = {1997},
month = {3}
}