Finite element solutions for flow in a single‐screw extruder, including curvature effects

Abstract

Authors' AdditionsThe above-titled article originally appeared in PE&S, 20 (5), 339-348. It is regretted that, owing to postal delays, it was not possible to incorporate proof corrections, among which are the following: P. 340. Second paragraph ("The only . . .") should be transposed to top of right-hand P. 343. Equation 9. Should read )IM = Y, + ail., ( V . U )~ dV; Equation 11. Denominator P. 344. Equation 16 should read: column on p. 339. should read: variational derivative of 1,. ( V . B )~ dV /,(V.U)~ dV [ 2.rr ps ' ' x channel volume over one pitch I € = P. 345. Right-hand column, line 4: for II P. 346. Appendix. Equation A-5: for d e 2 , r e a d d m . P. 347. Nomenclature. At Y entry, delete R ( l -r ) / H ;

NEW MELT CONVEYING MODELS FOR A SINGLE SCREW EXTRUDER1

“…The modified model, Eq. ( 1 3 , predicted the experimental data well and was even better than the numerical solution provided by Hami and Pittman (1980). This again confirms the importance of the side wall effects on the deep and highly curved screw channels.…”

“…10 the simplified flat plate model, the models given by Eq. (ll), (15) and (16), and the numerical solutions by Hami and Pittman (1980) are compared with the experimental data of Choo et al (1980). Their experiments used corn syrup, a Newtonian fluid.…”

“…(9), (15), and (16), respectively, of the modified models. Qhmi is the numerical solution of Hami and Pittman (1980). Due to a large helix angle 4 b and H/R, ratio, the simplified flat plate model gave significant overpredictions, while Eq.…”

“…Many problems that can or cannot be solved analytically can be studied using numerical methods. Hami and Pittman (1980) obtained a numerical solution for melt conveying in a single screw extruder, including the curvature effect using a finite element method.…”

Helical flow of polymer melts in extruders, part II: Model simulation and validation

“…Comparing to GP screw, the melt temperature simulated at the screw tip for the barrier screw is higher (3)(4) • C), which was expected considering the geometry of the barrier screw. Another difference is that increase in melt temperature is more gradual in barrier screw than the GP screw, which is also a more desirable property for a given screw design.…”