HIGHLY VISCOUS LIQUIDS VISCOSITY DETERMINATION METHOD AND THE DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC G01N11/14 G01N11/10 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the liquids absolute viscosity coefficient technique measuring, and more particularly to viscosity measuring by the rotating cylinders method between which the tested liquid is placed. Invention can be used to determine the highly viscous liquids viscosity. Described is the highly viscous liquids viscosity determining method, comprising placing the tested liquid in a container formed by a constant-size gap between the walls of the coaxial cylinders until completely filling of its volume, performing rotation the outer cylinder the relative to the inner cylinder, wherein the outer cylinder rotation relative to the inner cylinder is performed by the effect of weight attached to the lever connected to the outer cylinder, between the limiters by an angle from +α to -α relative to the horizontal plane passing through the coaxial cylinders axis of rotation. At that, using the stopwatch measuring the said outer cylinder T(η) rotation time, and the viscosity of the tested liquid η is determined by the formula: , where K_G is coefficient determined by the dimensions of the outer and inner cylinders and calculated by the formula: , K(α) is the coefficient determined by the outer cylinder angle of rotation and calculated by the formula: , T(η) is the outer cylinder rotation time; α is half angle of the outer cylinder rotation; η is viscosity of the tested liquid; L is length of the lever; M is weight of the load; g is acceleration of gravity; H is height of cylinders; R_out is the radius of the outer cylinder; R_in is the radius of the inner cylinder. Also proposed is the highly viscous liquids viscosity determining device, including coaxial cylinders of equal height, container, formed by a constant-size gap between the walls of the coaxial cylinders, into it are introduced lever with fixing elements, the weight fixed movably on the lever one end with the possibility of changing the torque, which other end is rigidly fixed to the outer cylinder, the side supports with the lever rotation limiters installed thereon, wherein the said coaxial cylinders rotation axes are arranged horizontally.

EFFECT: simplification of the device design and the ability to determine the highly viscous liquids viscosity at cryogenic temperatures with minimal errors.

2 cl, 2 dwg