Modeling spurt and stress oscillations in flows of molten polymers Export

@article{citeulike:6067037, abstract = {The paper presents an approach for modeling polymer flows with non-slip, slip and changing non-slip — slip boundary conditions at the wall. The model consists of a viscoelastic constitutive equation for polymer flows in the bulk, prediction of the transition from non-slip to sliding boundary conditions, a wall slip model, and a model for the compressibility effects in capillary polymer flows. The bulk viscoelastic constitutive equation contains a hardening parameter which is solely determined by the polymer molecular characteristics. It delimits the conditions for the onset of solid, rubber-like behavior. The non-monotone wall slip model introduced for polymer melts, modifies a slip model derived from a simple stochastic model of interface molecular dynamics for cross-linked elastomers. The predictions for the onset of spurt, as well as the numerical simulations of hysteresis, spurt, and stress oscillations are demonstrated. They are also compared with available data for a high molecular weight, narrow distributed polyisoprene. By using this model beyond the critical conditions, many of the qualitative features of the spurt and oscillations observed in capillary and Couette flows of molten polymers, are described.}, author = {Adewale, Kolapo P. and Leonov, Arkady I.}, citeulike-article-id = {6067037}, citeulike-linkout-0 = {http://dx.doi.org/10.1007/BF00366817}, citeulike-linkout-1 = {http://www.springerlink.com/content/pk08j3jn04480108}, day = {1}, doi = {10.1007/BF00366817}, journal = {Rheologica Acta}, keywords = {slip, spurt, wall\_slip}, month = {March}, number = {2}, pages = {110--127}, posted-at = {2009-11-04 08:59:40}, priority = {2}, title = {Modeling spurt and stress oscillations in flows of molten polymers}, url = {http://dx.doi.org/10.1007/BF00366817}, volume = {36}, year = {1997} }

TY - JOUR ID - citeulike:6067037 L3 - citeulike-article-id:6067037 N2 - The paper presents an approach for modeling polymer flows with non-slip, slip and changing non-slip — slip boundary conditions at the wall. The model consists of a viscoelastic constitutive equation for polymer flows in the bulk, prediction of the transition from non-slip to sliding boundary conditions, a wall slip model, and a model for the compressibility effects in capillary polymer flows. The bulk viscoelastic constitutive equation contains a hardening parameter which is solely determined by the polymer molecular characteristics. It delimits the conditions for the onset of solid, rubber-like behavior. The non-monotone wall slip model introduced for polymer melts, modifies a slip model derived from a simple stochastic model of interface molecular dynamics for cross-linked elastomers. The predictions for the onset of spurt, as well as the numerical simulations of hysteresis, spurt, and stress oscillations are demonstrated. They are also compared with available data for a high molecular weight, narrow distributed polyisoprene. By using this model beyond the critical conditions, many of the qualitative features of the spurt and oscillations observed in capillary and Couette flows of molten polymers, are described. IS - 2 JF - Rheologica Acta EP - 127 TI - Modeling spurt and stress oscillations in flows of molten polymers VL - 36 SP - 110 KW - slip KW - spurt KW - wall_slip AU - Adewale, Kolapo AU - Leonov, Arkady PY - 1997/03/01/ UR - http://dx.doi.org/10.1007/BF00366817 ER -