Apparatus and method for measuring elongational viscosity of a p

Details Apparatus and method for measuring elongational viscosity of a p Apparatus and method for measuring elongational viscosity of a p

1990-03-16

1991-11-05

Wallace, Linda J.

Measuring and testing

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

Viscosity

73866, G01N 1102

Patent

active

H00009768

ABSTRACT:
A novel falling cylinder extensional rheometer is provided for measuring elongational viscosity of a polymeric solution at stretch rates comparable to those associated with aerodynamic liquid breakup and which is suitable with toxic liquids. The rheometer consists of an upper cylinder and a lower cylinder, both vertically arranged or oriented and having their longitudinal axes coincidental. A small quantity of liquid is inserted between the end of the two cylinders that are vertically spaced one above the other. The upper cylinder is held fixed while the lower cylinder rests initially on top of an air cylinder piston. When the piston is activated, it quickly retracts downwardly allowing the lower cylinder to fall and stretch the liquid sample adhering between the ends of the upper and lower cylinders. A high speed camera is used to photograph the falling lower cylinder and the ligament stretching.

REFERENCES:
patent: 3463014 (1969-08-01), Katz et al.

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