Accession Number : ADD016139

Title :   Dielectric Viscometer Including Fixed and Variable Cells.

Descriptive Note : Patent, Filed 22 Jun 92, patented 18 Jan 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Williams, John G ; Donnellan, Thomas M ; Trabocco, Ronald E

Report Date : 18 Jan 1994

Pagination or Media Count : 7

Abstract : A parallel plate dielectric viscometer is provided for measuring the viscosity of a substance having differing substance dielectric properties at differing substance viscosities. Two electrodes are disposed in opposition to each other forming a variable dielectric cell having a dielectric distance between the electrodes. The viscosity of the substance is varied and force is applied to the substance to vary the dielectric distance according to the varying viscosity. The rate of change of the dielectric distance with respect to time is used to determine the viscosity of the substance. The viscosity may be varied by heating the substance and force may be applied to the substance by way of one of the electrodes such that the dielectric distance between the electrodes decreases as the substance becomes more viscous. A fixed cell may also be provided in order to correct for the effects of chemical changes in the substance.

Descriptors :   *CELLS, *DIELECTRIC PROPERTIES, *VARIABLES, *PATENTS, CHEMICALS, ELECTRODES, HEATING, PLATES, RATES, TIME, VISCOMETERS, VISCOSITY, PHASE

Subject Categories : Fluid Mechanics
      Electricity and Magnetism
      Physical Chemistry
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE