Non‐isothermal flow of a polymeric liquid through rounded rectangular ducts

Abstract

The 3D non-isothermal creeping flow of nylon-6 in a bent rectangular duct is studied numerically. A differential-type non-isothermal White-Metzner constitutive equation is used for this flow simulation. Computational results are obtained by the elastic-viscous split-stress (EVSS) finite element method, incorporating the streamline-upwind Petrov-Galerkin (SUPG) scheme. The generated thermal field is entirely due to viscous heating. Essential flow characteristics, including temperature distribution in the flow field, are predicted. The resulting average Nusselt numbers along the walls and dimensionless bulk temperatures along the channel are obtained. Subsequently, the effects of flow-rate and geometry are investigated.

Flow and heat transfer of a Giesekus fluid in plane and 3D ducts

“…Several theoretical and computational investigations were carried out to analyze the effect of secondary flows on the flow field for 3D geometries using different constitutive models such as Criminale‐Ericksen‐Filbey (CEF), Reiner‐Rivlin, Oldroyd‐3‐constant model, White‐Metzner model, Phan‐Thien‐Tanner (PTT) model, and Giesekus model . It was reported that the magnitude of these secondary vortices in the transversal cross‐section is usually lower than the longitudinal flow.…”