Heat transfer to a flowing thermally softened polymer (polymethylmethacrylate) has been studied. Experimental temperature profiles were determined at various axial lengths. The data are both precise and reproducible. Sizeable viscous dissipation was found to occur. This effect was found to be greater for polymethylmethacrylate than a molten polymer (polyethylene). Cooling as well as heating data were found in this work. The experimentally determined data checked qualitatively with the data computed from a prior analytical solution of the equations of motion and energy.
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Griskey et al. (1973) studied this question.
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