METHOD OF DETERMINING VISCOSITY OF NONLINEAR VISCOUS LIQUIDS AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2013 - IPC G01N11/02 

FIELD: chemistry.

SUBSTANCE: in the method of determining viscosity of nonlinear viscous liquids, the viscosity sensor used is a frequency-controlled drive in a set with an asynchronous electric motor of a mixer, whose synchronous supply frequency and motor voltage are stabilised. Viscosity is calculated from the mixer shaft speed and temperature of the liquid using the relationship: ν = b₀(Ω,t)+b₁(Ω,t)ω+b₂(Ω,t)ω², where ν is polymer viscosity, ω is motor shaft speed, t is polymer temperature, Ω is stabilised synchronous motor frequency, b₀, b₁ and b₂ are coefficients which depend on synchronous frequency and temperature. The apparatus for determining viscosity of nonlinear viscous liquids has a measuring vessel with a thermometer and a mixer rotated by an asynchronous motor which is controlled by a frequency converter with controlled frequency and voltage. A magnet is attached to the shaft of the mixer, wherein movement of the magnet is detected by a Hall sensor and an oscilloscope, signals from which are transmitted to a computer.

EFFECT: method of determining viscosity of non-Newton liquids on a stream, where spatial structure of the liquid medium should not be disrupted during measurement.

2 cl, 3 dwg