End face effect error elimination method and device for measuring apparent viscosity of non-Newtonian fluid

Abstract

The embodiment of the invention provides an end face effect error elimination method and device for measuring the apparent viscosity of non-Newtonian fluid. At least four groups of measured data of fluid to be measured are measured by using a coaxial double-cylinder rheometer, and linear fitting is performed according to the measured four groups of measured data and a theoretical linear function model to obtain a correlation coefficient after the linear fitting; and when the correlation coefficient of the linear fitting is greater than a preset correlation coefficient, an additional height ofan inner cylinder measured by the coaxial double-cylinder rheometer is calculated by an intercept and a slope of the theoretical linear function model, and a viscosity value in the fluid to be measured after end face effect errors are corrected is determined according to the calculated additional height of the inner cylinder, geometric parameters of the coaxial double-cylinder rheometer, running parameters of the coaxial double-cylinder rheometer and the measured data. The end face effect error elimination method for measuring the apparent viscosity of non-Newtonian fluid provided by the embodiment of the invention has higher operability and better practicality, accuracy, and efficiency.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method and device for eliminating end-face effect errors for measuring apparent viscosity of non-Newtonian fluids. Background technique [0002] The size of the fluid's ability to resist deformation is the viscosity of the fluid, also known as the viscosity coefficient, internal friction coefficient, and dynamic viscosity. Generally, fluids can be divided into Newtonian fluids and non-Newtonian fluids. Among them, Newtonian fluids satisfy Newton's law of internal friction, that is, at a certain temperature, the viscosity of Newtonian fluids is a constant independent of shear rate; non-Newtonian fluids do not satisfy Newtonian internal friction. The law states that the viscosity of a non-Newtonian fluid is related to the shear rate. [0003] Since the viscosity of non-Newtonian fluid is not a fixed value at a certain temperature, the viscosity of non-Newtonian fluid is cha...

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Problems solved by technology

[0005] The embodiment of the present invention provides an end face effect error elimination and device for measuring the apparent viscosity of a non-Newtonian fluid to solve the problem of obtaining the apparent viscosity of the non-Newtonian fluid when calculating the apparent viscosity of the non-Newtonian fluid in the prior art. There is an end face effect in the measured data, which makes the calculated apparent viscosity of the non-Newtonian fluid have a large error, resulting in the technical problem of inaccurate calculation results of the apparent viscosity of the non-Newtonian fluid

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