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首页> 外文期刊>Journal of Rheology >Dynamic shear rheology of a thixotropic suspension: Comparison of an improved structure-based model with large amplitude oscillatory shear experiments
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Dynamic shear rheology of a thixotropic suspension: Comparison of an improved structure-based model with large amplitude oscillatory shear experiments

机译：触变悬浮液的动态剪切流变学：改进的基于结构的模型与大振幅振荡剪切实验的比较

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摘要

Rheological measurements on a model thixotropic suspension by Dullaert and Mewis [J. Non-Newtonian Fluid Mech. 139(1-2), 21-30 (2006); Rheol. Acta 45, 23-32 (2005)] are extended to include large amplitude oscillatory shear (LAOS) flow, shear flow reversal, and a novel unidirectional LAOS flow to provide an extended rheological data set for testing constitutive models. We use this extended data set to test a new structure-based model developed by improving the Delaware thixotropic model [A. Mujumdar et al., J. Non-Newtonian Fluid Mech. 102,157-178 (2002); A. J. Apostolidis et al., J. Rheol. 59, 275-298 (2015)]. Model parameters are determined from steady, small amplitude oscillatory, and step shear rate tests. Holding those parameters fixed, model predictions are compared to LAOS experiments. Similar comparisons are made for three contemporary models from the literature. Two of these models use a scalar internal structural parameter and include the modified Jeffreys model proposed by de Souza Mendes and Thompson [Rheol. Acta 52, 673-694 (2013)]. The third model is based on fluidity additivity [F. Bautista et al., J. Non-Newtonian Fluid Mech. 80, 93-113 (1999)]. A common weakness in all models is shown to be the use of scalar order parameters that cannot account for the reversal of flow directionality inherent in LAOS flow. This is further illustrated by comparison with flow reversal and unidirectional LAOS experiments. (C) 2016 The Society of Rheology.
机译：Dullaert和Mewis在模型触变悬浮液上的流变学测量[J．非牛顿流体力学。 139（1-2），21-30（2006）; he Acta 45，23-32（2005）]扩展为包括大振幅振荡剪切（LAOS）流，剪切流逆转和新型单向LAOS流，以提供扩展的流变数据集以测试本构模型。我们使用此扩展数据集来测试通过改进特拉华触变模型[A. Mujumdar等人，J。非牛顿流体力学。 102,157-178（2002）; A.J.Apostolidis等人，J.Rheol。 59，275-298（2015）]。模型参数是通过稳定，小振幅振荡和阶跃剪切速率测试确定的。保持这些参数不变，将模型预测与LAOS实验进行比较。从文献中对三种当代模型进行了类似的比较。其中两个模型使用标量内部结构参数，并包括由de Souza Mendes和Thompson [Rheol。 Acta 52，673-694（2013）]。第三个模型基于流动性加和[F。 Bautista等人，J.Non-Newtonian Fluid Mech。 80，93-113（1999）]。在所有模型中，一个共同的弱点是使用标量阶数参数，该参数不能解决LAOS流固有的流向性反转的问题。通过与逆流和单向LAOS实验进行比较，可以进一步说明这一点。 （C）2016流变学学会。

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