A calometric capillary for the measurement of viscous heating in tube flow of molten polymers

J. Laven, H. Janeschitz-Kriegl

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)

Abstract

The design of a calorimetric capillary for use with a plunger-driven capillary rheometer is discussed. With this equipment it is possible to measure, during extrusion, the local radial heat flow out of the liquid through the wall of the capillary. From this, temperature gradients in the liquid can be derived. Results compare well (in case of PS) or reasonably well (in case of PE) with predictions from an analytical description of temperature distributions in power-law liquids as developed by the authors elsewhere. In the geometry used, the pressure dependence of viscosity and the decompression heating effect play an important role in the predictions. Melt flow anomalies (pulsated flow and melt fracture) are related to the measurement with the apparatus presented
Original languageEnglish
Title of host publicationProgress and trends in rheology 2 : Proceedings of the Second Conference of European Rheologists, Prague, June 17–20, 1986
EditorsH. Giesekus, M.F. Hibberd
Place of PublicationDarmstadt
PublisherD. Steinkopff-Verlag
Pages197-199
ISBN (Print)978-3-642-49339-3
Publication statusPublished - 1988

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