Abstract
This chapter outlines the important physical aspects of the flow of fluids, especially polymeric fluids, within capillaries. The problem appears deceptively simple in that, if a steady viscometric flow is assumed within the constant circular section tubing, it is generally very easy to derive equations from elementary constitutive equations which yield the velocity profile and pressure drop within the pipe. We shall discover that for polymer melts the flows are experimentally observed to be far from being viscometric within the capillary section; however, in spite of this, the ‘classic’ viscometric pressure drop equations are usually adequate for most engineering calculations, although of dubious merit for detailed characterisation of rheologically complex fluids.
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© 1993 Springer Science+Business Media Dordrecht
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Mackley, M.R. (1993). Capillary Rheometry. In: Collyer, A.A., Clegg, D.W. (eds) Rheological Measurement. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2898-0_1
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DOI: https://doi.org/10.1007/978-94-017-2898-0_1
Publisher Name: Springer, Dordrecht
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