Apparatus and method for viscosity measurements using a controll

Details Apparatus and method for viscosity measurements using a controll Apparatus and method for viscosity measurements using a controll

1992-02-10

1994-07-12

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

73 5415, G01N 1112

Patent

active

053277783

ABSTRACT:
An apparatus and method are disclosed for accurately determining viscosity of Newtonian and non-Newtonian fluids using a controlled needle viscometer. The controlled needle viscometer includes a vertical sample insert tube filled with the liquid of which the viscosity is to be determined. Using a needle guide at the top of the sample insert tube, a body having a known density is made to fall through the liquid in the sample insert tube. Using the time that the controlled needle takes to fall between two known distance marks or transducers, the velocity of the needle falling through the liquid is determined. Thus, the viscosity can be calculated by using the velocity of a controlled needle. In the method, viscosity, shear rate and shear stress can be calculated according to a modified power law model.

REFERENCES:
patent: 358877 (1887-03-01), Perkins
patent: 989822 (1911-04-01), Strasburger
patent: 1748512 (1930-02-01), Knopf
patent: 1894369 (1933-01-01), Duffing
patent: 2491389 (1949-12-01), Norcross
patent: 4637250 (1987-01-01), Irvine et al.
patent: 4852388 (1989-08-01), Park et al.
G. S. Smith, The Plunger Rheometer-Law of Flow For a Newtonian Liquid, Aug., 1957, pp. 227-230 of Min. of Supply, Aeronautical Inspection Directorate.
J. Lohrenz, G. Swift and F. Kurata, An Experimentally Verified Theoretical Study of the Falling Cylinder Viscometer, Dec. 1960, pp. 547-550 of A.I. Ch.E. Journal.

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