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Title: Rotational viscometer for high-pressure, high-temperature fluids

Abstract

The invention is a novel rotational viscometer which is well adapted for use with fluids at high temperatures and/or pressures. In one embodiment, the viscometer include a substantially non-magnetic tube having a closed end and having an open end in communication with a fluid whose viscosity is to be determined. An annular drive magnet is mounted for rotation about the tube. The tube encompasses and supports a rotatable shaft assembly which carries a rotor, or bob, for insertion in the fluid. Affixed to the shaft are (a) a second magnet which is magnetically coupled to the drive magnet and (b) a third magnet. In a typical operation, the drive magnet is rotated to turn the shaft assembly while the shaft rotor is immersed in the fluid. The viscous drag on the rotor causes the shaft assembly to lag the rotation of the drive magnet by an amount which is a function of the amount of viscous drag. A first magnetic pickup generates a waveform whose phase is a function of the angular position of the drive magnet. A second magnetic pickup generates a waveform whose phase is a function of the angular position of the third magnet. Means are providedmore » to generate an output indicative of the phase difference between the two waveforms. The viscometer is comparatively simple, inexpensive, rugged, and does not require shaft seals.« less

Inventors:
Issue Date:
OSTI Identifier:
6853201
Application Number:
ON: DE84011094
Assignee:
Dept. of Energy ERA-09-026897; EDB-84-085641
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; VISCOSIMETERS; DESIGN; MAGNETS; ROTATION; MEASURING INSTRUMENTS; MOTION 440300* -- Miscellaneous Instruments-- (-1989)

Citation Formats

Carr, K.R. Rotational viscometer for high-pressure, high-temperature fluids. United States: N. p., 1983. Web.
Carr, K.R. Rotational viscometer for high-pressure, high-temperature fluids. United States.
Carr, K.R. Mon . "Rotational viscometer for high-pressure, high-temperature fluids". United States.
@article{osti_6853201,
title = {Rotational viscometer for high-pressure, high-temperature fluids},
author = {Carr, K.R.},
abstractNote = {The invention is a novel rotational viscometer which is well adapted for use with fluids at high temperatures and/or pressures. In one embodiment, the viscometer include a substantially non-magnetic tube having a closed end and having an open end in communication with a fluid whose viscosity is to be determined. An annular drive magnet is mounted for rotation about the tube. The tube encompasses and supports a rotatable shaft assembly which carries a rotor, or bob, for insertion in the fluid. Affixed to the shaft are (a) a second magnet which is magnetically coupled to the drive magnet and (b) a third magnet. In a typical operation, the drive magnet is rotated to turn the shaft assembly while the shaft rotor is immersed in the fluid. The viscous drag on the rotor causes the shaft assembly to lag the rotation of the drive magnet by an amount which is a function of the amount of viscous drag. A first magnetic pickup generates a waveform whose phase is a function of the angular position of the drive magnet. A second magnetic pickup generates a waveform whose phase is a function of the angular position of the third magnet. Means are provided to generate an output indicative of the phase difference between the two waveforms. The viscometer is comparatively simple, inexpensive, rugged, and does not require shaft seals.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {6}
}