Abstract
Capillary rheometry is concerned with the way fluid or ductile material flows into and within a capillary. In most circumstances the pressure difference along the capillary is measured as a function of the material flow rate and certain rheological information is inferred from this data. In this chapter we review the understanding of capillary rheometry at three different levels. At the first level we assume simple boundary conditions and constitutive equations, and by combining them we can arrive at analytic expressions for the connection between pressure difference and the constitutive response. At the second level we resort to the numerical solution of both entry and capillary flow combined with a non-linear viscous constitutive response. Finally we address the classic polymer melt flow problem where the numerical simulation is carried out for a full viscoelastic material response. Capillary rheometry is a subject of central importance to rheology and it has been widely covered in the literature and books, e.g. Boger (1987), Tanner (1988), Denn (1980) and Dealy and Wissbrun (1990).
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Mackley, M.R., Rutgers, R.P.G. (1998). Capillary rheometry. In: Collyer, A.A., Clegg, D.W. (eds) Rheological Measurement. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4934-1_5
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DOI: https://doi.org/10.1007/978-94-011-4934-1_5
Publisher Name: Springer, Dordrecht
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