The principle of capillary viscometer

A viscometer based on Hagen Poisson's (Hagen-Poisculli) rule is obtained by measuring the flow rate of fluid flowing through the capillary, the pressure difference between the capillary outlet and the inlet, and then according to Hagen Poisson's law.

Capillary viscometer

A viscometer based on Hagen Poisson's (Hagen-Poisculli) rule is obtained by measuring the flow rate of fluid flowing through the capillary, the pressure difference between the capillary outlet and the inlet, and then according to Hagen Poisson's law.

Hagen - bershaw leaf formula:

ETA = (n R^4Pt) /8VL

Among them:

V--t time flows through the capillary volume

R-- capillary radius

P-- capillary pressure difference at the end of two

L-- capillary length

As long as the volume, time and pressure added to the liquid are obtained, the viscosity of the liquid can be reversed.

There are three main types of capillary viscometer: round - piston, glass tube and pass viscometer. The circular hole - piston viscometer allows for greater pressure, so it can be used to determine the viscosity of the polymer.

The pore type viscometer is also called the short tube type, and the small pore type can be used for rough measurement and viscosity comparison of Newtonian fluid. Glass tube type viscosity and wide application, can be divided into gravity type and pressure type. The gravity type is generally used to measure the Newton fluid, and the pressure type can be used to measure the non Newton fluid. There are many kinds of glass capillary viscometer, most of which are named by the designer's name abroad. The methods of their construction and use are all the same.