ISSN:
0001-1541
Schlagwort(e):
Chemistry
;
Chemical Engineering
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
Notizen:
A steady, isothermal flow of a two-phase fiber spinning has been studied. To investigate the spinline velocity profile affected by the interaction between two fluids with different rheological properties, a Newtonian and an upper-convected Maxwell fluid were considered to be the core and skin layers, respectively. Unlike the one-dimensional analysis, which has been the typical approach for spinning flows, radial dependency of the flow field was maintained in our analysis. Consequently, a set of partial differential equations were derived for the flow field in the draw-down region where lubrication scalings are applicable. Asymptotic solutions were then obtained for two limiting cases, where the Deborah number of the skin layer is small and the applied axial tension is large. When the Deborah number of the skin layer is small, a velocity correction to the Newtonian profile indicates a strong effect of the flow rate ratio as well as the shear viscosity ratio of the two fluids. For the case of a large applied tension, which is more relevant to industrial practice, very interesting flow behaviors are predicted. In this limit, the viscoelasticity effect of the skin layer is shown to be dominant and dictates the mechanics of the flow even when both its flow rate and shear viscosity may be much smaller than those of the Newtonian core layer. The result also predicts that hoop stress has a negligible effect on the axial velocity profile.
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/aic.690360205
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