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 language | English |
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| Title of host publication | Progress and trends in rheology 2 : Proceedings of the Second Conference of European Rheologists, Prague, June 17–20, 1986 |
| Editors | H. Giesekus, M.F. Hibberd |
| Place of Publication | Darmstadt |
| Publisher | D. Steinkopff-Verlag |
| Pages | 197-199 |
| ISBN (Print) | 978-3-642-49339-3 |
| Publication status | Published - 1988 |