Instrument for determining rheological properties of Non-Newtonian viscosity fluid

A viscous fluid and rheological characteristics technology, applied in the field of fluid mechanics, can solve the problems of not being able to obtain the shear rate and measuring the change of viscosity with the rotating speed, etc., and achieve the effect of high utilization efficiency and wide measurement range

Inactive Publication Date: 2003-10-22
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Since the RTW-04 melt physical property comprehensive tester can only measure the viscosity of the melt at a certain speed (300rpm), but cannot measure the change of viscosity with the speed, it cannot obtain the shear rate (τ) and shear rate to describe the melt. Shear stress (D) relationship

Method used

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  • Instrument for determining rheological properties of Non-Newtonian viscosity fluid
  • Instrument for determining rheological properties of Non-Newtonian viscosity fluid

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Experimental program
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Embodiment Construction

[0013] In the experiment, standard oils GBW13608 and GBW13609 issued by China Institute of Metrology were used, and their dynamic viscosity values ​​were 0.5153Pas and 0.9193Pas respectively. According to the statistics of multiple sets of experimental data, the average variance of the viscosity data is σ=0.0391, indicating that the modified experimental device has high reliability.

[0014] According to the error analysis method of uncertainty, the measurement system error can be divided into two parts: one is random uncertainty, such as the standard deviation σ value obtained when measuring the viscosity of standard oil; the other is system uncertainty, including Viscometer or standard oil error, temperature control equipment error, torque sensor error. Table 1 shows the system error analysis of the improved melt physical property tester in measuring rheological properties. According to the formula of error transmission, the maximum relative error of the system is the sum o...

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Abstract

The invention belongs to the hydro-mechanical field, especially refers to an apparatus determining the rheological properties of the hgh-temperature Newton viscous melt, composed of transformer, computer control system, cooling water system, control box, measuring rod, graphite protection tube, molybdenum measuring head, graphite crucible, tungsten-rhenium thermocouple, high-temperature resistance furnace, argon-gas pot, sensor and electric motor and its character lying in that it adds variable-frequency speed governing power supply, multiturn potentiometer, digital speed meter, stabilized voltage supply and speed meter's control box. It can determine viscous fluid as well as time-correlative fluid. It can describe the relation of cut rate (*) and cut stress (D).

Description

Technical field: [0001] The invention belongs to the field of fluid mechanics, in particular to an instrument for measuring the rheological properties of high-temperature non-Newtonian viscous melts. technical background: [0002] The following method can be used to measure the rheological properties of high-temperature melts with unknown flow properties, that is, the relationship between different shear rates (τ) and shear stress (D) can be obtained through a high-temperature rotary viscometer with adjustable speed, and then determined by Whether the relationship between τ~D is a straight line determines whether the melt is a Newtonian fluid. [0003] The viscosity of the melt was measured using a viscometer with a coaxial rotating body sensing system. When a certain fixed speed is selected, the apparent viscosity η of the melt at this speed can be obtained a , the calculation formula is: [0004] n a =KΔM [0005] K-instrument constant; ΔM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 吴铿张二华赵勇孙国军郜学
Owner UNIV OF SCI & TECH BEIJING
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