Method and system for obtaining wall slip curve based on parallel plate rheological test

Abstract

An embodiment of the present invention provides a method and system for obtaining a wall slip curve based on a parallel plate rheological test. The method includes: using a parallel plate structure for a rotational rheological test, and setting the rotor radius to a constant value during the test, The rotational speed of the rotor, the material of the shear plane and the distance between the shear planes are set as variables; when the rotational speed of the rotor is detected, the flow field with the same topological structure of the flow field is differentially compressed to obtain a simple shear A flow field model; according to the simple shear flow field model, a wall slip curve is obtained. The embodiment of the present invention uses a rotational rheometer with a parallel plate structure to test, and the required data can be directly provided by the rheometer. Compared with the traditional pipeline pressure flow mode, it is simpler and requires less sample volume. Instrument cleaning and The maintenance is simpler; on the premise of not substituting the fluid and slip model, the original data is directly differentiated, and the research problem is simplified to a simple shear flow, while retaining the accurate description of the original flow field.

Description

technical field [0001] The invention relates to the technical field of rheology, in particular to a method and system for obtaining wall slip curves based on parallel plate rheological tests. Background technique [0002] The test of rheometer is a complex problem affected by many factors. During the test of rotational rheology, the viscous force generated by the fluid movement driven by the rotor acts on the surface of the sensor to form a torque (generally the sensor is the rotor) . The shear stress data directly given by the traditional rheometer is obtained according to the calculation formula of Newtonian fluid in the case of no wall slip, but the rheological curve of non-Newtonian fluid cannot be obtained accurately, so that the non-Newtonian fluid constitutive The parameter identification of the model is biased. Even if the rheological curve of non-Newtonian fluid without wall slip is obtained by differential, the traditional processing method does not consider the ...

AI Technical Summary

Problems solved by technology

The integration and differentiation of the model will bring computational complexity, and at the same time the actual situation does not match the model and lead to large deviations

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