纤维素黏度测量结果的统一方程拟合

Unified Equation Fitting of Measurement Results of Cellulose Viscosity

在Lyocell纤维生产过程中,需要用溶解木浆作为纤维素原液,由于纤维素原液的黏度极高,在生产设备内部流动过程中产生的流阻极大。大量实验研究证实,纤维素原液黏度主要与流体剪切速率及温度有关。为研究纤维素原液的黏度随温度变化关系,为纤维素生产设备的工艺设计提供依据,对某型纤维素原液黏度在5组温度下与应变速率的关系进行测量,并将测量结果回归为黏度—应变速率方程,将方程中的系数和指数视为温度参变数,对方程进行拟合,为编制纤维素冷却器自动设计程序提供算法基础。

Dissolved wood pulp is used as the cellulose stock solution in the production of Lyocell fibers.As cellulose stock solution has extremely high viscosity,which generates great flow resistance during the internal flow of the production equipment.Numerous experimental studies have confirmed that the viscosity of cellulose stock solution is mainly related to the shear rate and temperature of the fluid.In order to study the relationship between the viscosity of cellulose stock solution and temperature so as to provide a basis for the process design of cellulose production equipment,the relationship between the viscosity of a certain type of cellulose stock solution at five groups of temperatures and the different strain rates are measured,and the measurement results are regressed to the viscosity-strain rate equation at five measured temperatures.Taking the coefficients and exponents in the five viscosity-strain rate equations as the temperature parameters,the five equations are fitted,which provides an algorithm basis for subsequent computer-automated design program of cellulose cooler.