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本文阐述了当前在设计和使用旋转粘度仪中所存在的一些问题。目前的旋转粘度仪,是按牛顿液体内摩擦定律设计的,这对牛顿液体流变参数的测量和计算是较为准确的,但用以测量和计算非牛顿液体的流变参数,则会产生不可忽视的误差。本文依据非牛顿液体的流变规律,从理论上阐明了用这种仪器测量和计算非牛顿液体时,对哪些流变参数是较为准确的,哪些流变参数会产生较大的误差,以及这些误差的范围、影响因素和解决途径等,并提供通过仪器校正系数 B,和计算非牛顿液体的速度梯度,达到准确测定非牛顿液体流变性能的方法。为了在引入 B 值后仍能较方便地计算塑性液体的动切应力,文章还介绍了改进设计旋转粘度仪的有关方法。
This article describes some of the current problems in designing and using rotational viscometers. The current rotational viscometer is designed according to Newton’s law of internal friction, which is accurate for the measurement and calculation of Newtonian liquid rheological parameters. However, the rheological parameters of non-Newtonian liquids are not accurate Neglected error. In this paper, based on the non-Newtonian fluid rheology, we theoretically explain that when using this instrument to measure and calculate non-Newtonian fluid, which rheological parameters are more accurate and which rheological parameters will produce larger errors, and these Error range, influencing factors and solutions, etc., and to provide a method to accurately determine the rheological properties of non-Newtonian liquid through the instrument calibration coefficient B, and calculate the velocity gradient of non-Newtonian liquid. In order to calculate the dynamic shear stress of plastic liquid after the introduction of B value, the article also introduces the related methods of improving the design of rotary viscometer.