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本工作在使用高化(Koka)氏流变仪测得流变数据的基础上,不用描绘流动曲线,而是选用适当的数学模型,采用回归分析法,在建立非牛顿指数的剪切速率(或剪切应力)和温度的回归方程式后,就可方便而准确地计算出非牛顿指数。对于假塑性流体,其表观非牛顿指数可用下式描述 n’=1+a_2-a_3/T-2a_4 lg γw’式中,a_2、a_3、a_4为待定的回归系数,T为绝对温度(K),γw’为表观剪切速率(秒~(-1))。
Based on the rheological data measured by Koka rheometer, this work does not describe the flow curve, but chooses the appropriate mathematical model and uses regression analysis method to establish the non-Newtonian shear rate ( Or shear stress) and the temperature of the regression equation, you can easily and accurately calculate the non-Newton’s index. For pseudoplastic fluid, the apparent non-Newtonian index can be described by the following formula: n ’= 1 + a_2-a_3 / T-2a_4 lg γw’ where a_2, a_3 and a_4 are the regression coefficients to be determined, T is the absolute temperature (K ), γw ’is the apparent shear rate (sec ~ (-1)).