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dc.contributor.authorGilbert, Peter H.
dc.contributor.authorGiacomin, A. Jeffrey
dc.date.accessioned2014-05-14T14:09:24Z
dc.date.available2014-05-14T14:09:24Z
dc.date.issued2014-05-14
dc.identifier.urihttp://hdl.handle.net/1974/12185
dc.description.abstractWhen molten plastic is extruded from a die, it can collect on the open die face. Called die drool, this phenomenon costs plastics manufacturers by requiring shutdown for die cleaning. This has been attributed to cohesive failure within the fluid at an internal surface, where the fluid slips on itself; the corresponding isothermal analysis led to an analytical solution for the drool rate [Schmalzer and Giacomin, J. Polym. Eng., 33, 1 (2013)]. In this paper, we account for the frictional heating at the cohesive slip interface, which we call slip heating. We focus on slit flow, which is used in film casting, sheet extrusion, curtain coating, and in many other chemical engineering unit operations. In slit flow, the magnitude of the heat flux from the slipping interface is the product of the shear stress and the slip speed. We present the solution for the temperature rise in pressure-driven slit flow subject to constant heat generation at the cohesive slip interface. We solve the energy equation in Cartesian coordinates for the temperature rise in both the transient and steady temperature profiles in the drool layer and in the bulk polymer. We then evaluate the effect of this temperature rise on the rate of die drool. For this simplest relevant non-isothermal problem, we neglect viscous dissipation and convective heat transfer in the melt and model viscosity as an Arrhenius function of temperature. We conclude with three worked examples showing the relevance of slip heating in determining die drool flow rates. We find that slip heating diminishes die drool. We arrive at two sufficient dimensionless conditions for the accurate use of our results: Br ≪1 or Gi ≪1.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesPolymers Research Group Technical Report Seriesen_US
dc.relation.ispartofseriesQU-CHEE-PRG-TR--2014-1en_US
dc.subjectDie droolen_US
dc.subjectSlip heatingen_US
dc.subjectDrool layeren_US
dc.subjectCohesive fractureen_US
dc.subjectPlastics extrusionen_US
dc.titleSlip Heating in Die Droolen_US
dc.typeTechnical Reporten_US


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