Zum Fließverhalten Nicht-Newtonscher Flüssigkeiten in konischen Düsen

Flow of viscoelastic polymeric melts through converging ducts

“…3 and the streak photograph shown in fig. This contradicts certain theoretical studies reported in the literature (2)(3)(4)(5)(6). That is, there appears to be no noticeable evidence of circulatory motion of the flowing melt as it approaches the exit plane.…”

“…In the past several authors have given some theoretical consideration to the converging flow of viscoelastic fluids using nonlinear viseoelastic models; namely, Kaloni (2,3) using the Oldroyd fluid mode1, Schümmer (4,5) using a fourth order fluid model, and Wissler (6) using a nonlinear Maxwell modeL In their attempts these authors employed the perturbation technique, and they all concluded that the inclusion of secondorder perturbation terms (which bring in non-Newtonian effects) predicts velo¢ity profiles with super-130 imposed secondary circulation patterns. It should be pointed out, however, that there are only a few pieces of experimental evidence which appear to support the theoretically predicted secondary circulation patterns of viscoelastic fluids flowing through a converging duct.…”

Viscoelastic Effects in the Flow of Non-Newtonian Fluids through a Porous Medium

“…This procedure has been used by a number of authors under similar circumstances (Langlois and Rivlin, 1957;Ramacharyulu, 1967a,b;Schummer, 1967Schummer, , 1968. Starting from this point, one can construct the next solution and proceed sequentially as far as necessary.…”

“…Principal results are tabulated in the order in which they appear in calculations for each order of approximation (see Tables I-IV). The nature of these flows has been discussed in detail by Raniacharyulu (1967a,b) and Schummer (1967Schummer ( , 1968. The nature of these flows has been discussed in detail by Raniacharyulu (1967a,b) and Schummer (1967Schummer ( , 1968.…”

Inertia effect in conical converging flow of viscoelastic fluids

“…Hence, an expansion form may be employed and a perturbation solution may be expected to converge over a substantial portion of the flow field. Some early calculations are known for the case of creeping flow [6,7]. Other authors have mentioned the influence of inertia [8,9].…”