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开展端面附加力矩的研究是为了正确地指导旋转粘度仪的设计,调试及其使用,以达到准确测量各类液体流变性能的目的。长期以来,国内外旋转粘度仪均使用已知粘度的牛顿液体(标准油)作为仪器标定和消除端面效应的依据。这对牛顿液体的测量是较合理的,但对非牛顿液体的测量则会产生较大的误差。本文依据各类液体的流变规律,从理论上提出了这些液体作用在内筒端面的附加力矩公式及其相互关系。文章进一步将这些关系,采用数学推理的方法,通过动切应力修正系数A和稠度修正系数Z_n′把测量非牛顿液体统一在测量牛顿液体所设计的弹簧总旋转力矩上,这样既保证了非牛顿液体的准确测量,又使问题简化,给设计和使用带来了极大的方便。文章同时还指出了范氏旋转粘度仪在端面附加力矩值上所存在的问题,并对给出的有关流变参数计算式作了必要的修正。
To carry out the study of the additional torque on the face is to correctly guide the design, commissioning and use of the rotary viscometer so as to achieve the purpose of accurately measuring the rheological properties of various liquids. For a long time, both domestic and foreign rotary viscometers use Newtonian liquid (standard oil) with known viscosity as the basis for instrument calibration and elimination of end effect. This measurement of Newton’s liquid is more reasonable, but the measurement of non-Newtonian liquid produces a large error. In this paper, according to the rheological law of all kinds of liquids, the formulas of the additional moments for these liquids to act on the end face of the inner cylinder and their relations are theoretically proposed. The paper further uses the mathematical reasoning method to unify the measurement of non-Newtonian liquid to measure the total spring moment of Newtonian liquid designed by the dynamic shear stress correction coefficient A and the consistency correction coefficient Z_n ’, so that the non-Newtonian Accurate measurement of liquids, but also to simplify the problem, to the design and use has brought great convenience. At the same time, the article also points out the problems existing in the value of the additional torque of the Fanker rotary viscometer, and makes some necessary amendments to the calculation formula of rheological parameters.