Correction method for rheological test data of coaxial cylinder rheometer

A technology of test data and rheometer, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as aggravating unsteady flow, affecting researchers, and being unable to obtain rheological parameters

Active Publication Date: 2016-09-07
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the unsteady state process caused by the change of shear rate (stress) during the transient process of the rotational rheometer from static start to the set shear rate or shear stress, the response relationship of the steady state process is still used to Unable to obtain accurate rheological parameters
At the same time, subject to the existing mechanical level, the rheometer motor inertia, fixture inertia...

Method used

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  • Correction method for rheological test data of coaxial cylinder rheometer
  • Correction method for rheological test data of coaxial cylinder rheometer
  • Correction method for rheological test data of coaxial cylinder rheometer

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Embodiment 1

[0054] figure 1 is the actual model of the rotational rheometer coaxial cylinder test system, figure 2 It is a simplified diagram of the model of two infinite parallel plates. figure 1 The width of the measurement gap is much smaller than the height of the measurement fixture. According to the axial symmetry of the flow field in the coaxial cylinder, the model is further simplified to a one-dimensional transient model of the flow field changing along the radial direction, namely figure 2 The Couette flow between two infinitely large plates. and in figure 2 Considering the system inertia in the simplified model, the torque balance relationship at the boundary of the measuring fixture is established. The boundary of the measurement gap includes dynamic boundary and static boundary. The dynamic boundary gradually becomes stable from static in the initial process, and the flow field also gradually develops from static to stable.

[0055] Such as figure 1 — Figure 4 As sh...

Embodiment 2

[0077] A method for correcting rheological test data of a rotational rheometer cone-plate system or a flat-plate system, the specific steps are as follows:

[0078] Step 1: Put the sample to be tested in the cone-plate system or plate system of the rotational rheometer;

[0079] Step 2: Carry out experiments in the setting mode and collect data;

[0080] Step 3: Introducing the torque correction item of shear stress to calculate the corrected fluid shear torque, and the corrected rotational rheometer cone-plate system or flat-plate system to measure the real shear stress and real transient viscosity at the boundary of the fixture.

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Abstract

The invention discloses a correction method for rheological test data of a coaxial cylinder rheometer. The correction method specifically comprises the following steps: putting a sample to be tested into a coaxial cylinder rheometer test system; carrying out a test under a set mode, and acquiring data; introducing an angle acceleration correction item for shear stress to calculate real shear stress at the boundary of a corrected coaxial cylinder measurement clamp and apparent viscosity of a corrected material. The correction method has the beneficial effects that by introducing a torque correction item and considering torque consumption of a system inertia (a motor rotor inertia and a measurement clamp inertia), deviations of the rheological data acquired by the conventional rheometer can be corrected, and the rheological property of a medium to be tested can be recognized more accurately.

Description

technical field [0001] The invention relates to a coaxial cylinder rheometer, in particular to a correction method for the rheological test data of the coaxial cylinder rheometer. Background technique [0002] Rotational rheometer is an important tool for rheological measurement, and its accurate measurement will provide a series of reliable basic data for the research on the rheological properties of materials in the industrial and scientific research fields. The rotational rheological measurement is to collect the motion parameters at the boundary of the measurement gap through the rotational rheometer acquisition system, and convert the corresponding rheological parameters (stress, shear rate, strain, etc.) according to the mechanical response relationship between the motion parameters and the rheological parameters. etc.) indirect measurement methods. [0003] At present, most rotational rheometers use the response relationship between the motion parameters and the rheo...

Claims

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Application Information

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IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor 刘刚徐睿妤陈雷许继凯
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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