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Experimental and simulation studies of heat transfer in polymer melts
Author(s) -
Chen Hongbing,
Sundararaj Uttandaraman,
Nandakumar K.
Publication year - 2003
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690490604
Subject(s) - thermodynamics , heat transfer , materials science , heat transfer coefficient , convection , polyethylene , viscosity , convective heat transfer , mechanics , chemistry , physics , composite material
The heat transfer of a single solid cylindrical poly(ether imide) (PEI) pellet in polyethylene (PE) melt under simple shear flow was studied using experiments and numerical simulations. This included two approximate 2‐D representations of the geometry, and a rigorous 3‐D geometry matching the experimental conditions. A generalized power‐law viscosity model for PE melt, and temperature‐dependent conductivity and specific heat were used for PEI in the models. Viscous dissipation was included in the simulations. From the experimental temperature history, the mean heat‐transfer coefficient h̄ was determined to be 370 W/m 2 ·K, with the assumption of a uniform convective environment. From the simulation, h̄ was determined to be 1,160 W/m 2 ·K and 420 W/m 2 ·K in the 2‐D simulations with circular and rectangular pellet, respectively, and 250 W/m 2 ·K for the 3‐D simulation. Results from the 3‐D simulation proved that the uniform convection assumption used to calculate h̄ for the experiment was not acceptable.