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Energy transport to molten flowing polymer systems: II. Analysis of data and development of temperature profiles with axial length
Author(s) -
Saltuk Ismail,
Siskovic Nandor,
Griskey Richard G.
Publication year - 1972
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760120603
Subject(s) - nusselt number , dissipation , thermodynamics , materials science , mechanics , polymer , thermal , composite material , physics , reynolds number , turbulence
Energy transport to molten, flowing polymer has been studied. Experimental temperature profiles were determined at various axial lengths. These data are both precise and reproducible. Viscous dissipation was found to be a significant factor in these systems. In addition, sizable thermal expansion cooling effects were noted. It was also shown that the effect of viscous dissipation on Nusselt number was a function of Graetz number. At high Graetz numbers viscous dissipation had a sizable effect that declined to negligible proportions at Graetz values of 7 or less. Prior theoretical treatment of temperature profile development is shown to be only qualitatively correct.