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

Abstract

The embodiment of the invention provides a method and system for obtaining a wall surface slip curve based on a parallel plate rheological test. The method comprises the steps of employing a rotational rheological test of a parallel plate structure, setting the radius of a rotor as a fixed value in a testing process, and setting the rotating speed of the rotor, the material of a shearing surface and the spacing of the shearing surface as variables; when the change of the rotating speed of the rotor is detected, carrying out error-free compression on a flow field with an invariable flow field topological structure to obtain a simple shear flow field model; and obtaining a wall surface slip curve according to the simple shear flow field model. According to the embodiment of the invention, arotational rheometer additionally provided with a parallel plate structure is used for testing, required data can be directly provided by the rheometer, and compared with a traditional pipeline pressure flow mode, the mode is simpler, the required sample quantity is smaller, and the instrument is simpler to clean and maintain; on the premise of not substituting the fluid and slip model, the original data is directly subjected to differential processing, the research problem is simplified into simple shear flow, and meanwhile, the accurate description of the original flow field is reserved.

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 ...

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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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