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用旋转粘度计法研究非牛顿流体的流变性能
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| 摘 要：本文主要介绍在5个不同减阻剂浓度(0 mg/L,100 mg/L,200 mg/L,300 mg/L,400 mg/L)和不同温度(15℃,20℃,25℃)下,用旋转粘度计法测定减阻剂样品在7min内，剪切速率从0~183.45/s下，研究0号柴油及加入减阻剂后的流变性能。一般情况下，幂律模型适合于大部分非牛顿流体。加剂后的柴油溶液，与空白柴油相比较，稠度都有不同程度的提高。在低剪切速率下，大多数实验结果表现为牛顿流体流变行为，但D-41（块）溶液例外，浓度为300mg/L的15℃和20℃及浓度为400mg/L的25℃表现出假塑性流动行为。浓度与粘度的线性关系用关系和指数关系相对于乘幂关系拟合程度较高，而用乘幂关系拟合程度较低。粘度与温度间服从于阿累尼乌斯方程。 |
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| Study on rheological properities of non-newtonian fluids by using |
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| Abstract：In this paper, rheological properties of 0# diesel oil that was dissolved drag reduction polymers was evaluated by using a rotational viscometer at five concentrations (0~400mg/L) and three temperatures(15,20 and 25℃).Samples were subjected to a programmed shear rate increasing 0~183.45s-1 in seven minutes. In general, the power law model fitted most of non-Newtonian fluids. For diesel oil of drag reduction polymer solutions, compared with the diesel oil ,viscosity was advanced to some extent. At the at low shear rate, most of the experimental results behaved as Newtonian fluids. D-41solutions were exceptions, behaved as pseudoplastic fluids .Three models (leaner, exponential, power) were used to evaluate the viscosity-concentration relationship. It shows that leaner and exponential models were higher than power model. Arrhenius model was used to investigate the viscosity-temperature relationship. After comparing with the three samples, we suggested that nubby sample (DR-142) was mostly affected by temperature. |
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