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Publisher's PDF.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.University of Delaware. Department of Chemical & Biomolecular Engineering

Dynamic shear rheology of a thixotropic suspension: Comparison of an improved structure-based model with large amplitude oscillatory shear experiments