ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
HEAT TRANSFER IN RHEOLOGICAL SYSTEMS: MOLTEN POLYMERS
Résumé
Heat transfer phenomena will be reviewed for
polymeric fluids, the largest class of non-Newtonian
materials. The rheological properties together
with the extreme thermal properties give rise to
very specific heat transfer behavior. The rheology
of polymeric fluids is described together with its
temperature dependence. The important dimensionless
groups are discussed. The sensitivity of the
physical properties to temperature results in a
pronounced coupling between temperature and flow
field. Nonisothermal flow (related to polymer
processing) at various boundary conditions is analyzed.
Influential rheological phenomena are shear
thinning, large viscous dissipation, elasticity.
Solution procedures are given for heat transfer in
shear flow (neglecting elasticity) and for the
development of molecular orientation in nonisothermal
flows of molten polymers. The orientation
development is described by a memory integral
constitutive equation.