Viscoelastic sink flow in a wedge for the UCM and Oldroyd-B models

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Abstract

The steady planar sink flow through wedges of angle π/α with α≥1/2 of the upper convected Maxwell (UCM) and Oldroyd-B fluids is considered. The local asymptotic structure near the wedge apex is shown to comprise an outer core flow region together with thin elastic boundary layers at the wedge walls. A class of similarity solutions is described for the outer core flow in which the streamlines are straight lines giving stress and velocity singularities of O(r−2) and O(r−1), respectively, where r≪1 is the distance from the wedge apex. These solutions are matched to wall boundary layer equations which recover viscometric behaviour and are subsequently also solved using a similarity solution. The boundary layers are shown to be of thickness O(r2), their size being independent of the wedge angle. The parametric solution of this structure is determined numerically in terms of the volume flux Q and the pressure coefficient p0, both of which are assumed furnished by the flow away from the wedge apex in the r=O(1) region. The solutions as described are sufficiently general to accommodate a wide variety of external flows from the far-field r=O(1) region. Recirculating regions are implicitly assumed to be absent.
LanguageEnglish
Pages39-46
Number of pages8
JournalJournal of Non-Newtonian Fluid Mechanics
Volume154
Issue number1
DOIs
StatusPublished - Sep 2008

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Wedge
sinks
wedges
Boundary layers
Apex
core flow
apexes
Boundary Layer
Similarity Solution
boundary layers
wedge flow
boundary layer equations
Model
Fluxes
Oldroyd-B Fluid
Parametric Solutions
Angle
Fluids
far fields
Streamlines

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Viscoelastic sink flow in a wedge for the UCM and Oldroyd-B models. / Evans, Jonathan; Hagen, T.

In: Journal of Non-Newtonian Fluid Mechanics, Vol. 154, No. 1, 09.2008, p. 39-46.

Research output: Contribution to journalArticle

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