A precise, reproducible method has been developed for measuring temperature profiles in flowing molten polymers with heat transfer. Experimental data determined by this method showed that viscous dissipation occurred, but not at the level predicted theoretically. The difference between the actual and theoretical viscous dissipation was possibly due to flattening of fluid velocity profile, changing physical properties, and fluid viscoelasticity. Nusselt numbers calculated from the data checked thoretical Nusselt‐Graetz solutions.
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Griskey et al. (1966) studied this question.
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