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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 includes 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. An output ismore » generated indicative of the phase difference between the two waveforms.« less

Inventors:
 [1]
  1. (Knoxville, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
865336
Patent Number(s):
4499753
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
rotational; viscometer; high-pressure; high-temperature; fluids; novel; adapted; temperatures; pressures; embodiment; substantially; non-magnetic; tube; closed; communication; fluid; viscosity; determined; annular; drive; magnet; mounted; rotation; encompasses; supports; rotatable; shaft; assembly; carries; rotor; bob; insertion; affixed; magnetically; coupled; third; typical; operation; rotated; immersed; viscous; drag; causes; lag; amount; function; magnetic; pickup; generates; waveform; phase; angular; position; output; generated; indicative; difference; waveforms; rotatable shaft; phase difference; angular position; shaft assembly; magnetically coupled; rotational viscometer; temperature fluids; temperature fluid; /73/

Citation Formats

Carr, Kenneth R. Rotational viscometer for high-pressure high-temperature fluids. United States: N. p., 1985. Web.
Carr, Kenneth R. Rotational viscometer for high-pressure high-temperature fluids. United States.
Carr, Kenneth R. Tue . "Rotational viscometer for high-pressure high-temperature fluids". United States. https://www.osti.gov/servlets/purl/865336.
@article{osti_865336,
title = {Rotational viscometer for high-pressure high-temperature fluids},
author = {Carr, Kenneth 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 includes 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. An output is generated indicative of the phase difference between the two waveforms.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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