Flow Characterization of Viscoelastic Fluids around Square Obstacle

  • Guler Bengusu Tezel Department of Chemical Engineering, Faculty of Engineering and Architecture, Abant Izzet Baysal University, 14280, Bolu, Turkey
  • Kerim Yapici Department of Chemical Engineering, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Isparta, Turkey
  • Yusuf Uludag Department of Chemical Engineering, Middle East Technical University, 06800 Ankara, Turkey

Abstract

This study focuses on the computational implementation of structured non-uniform finite volume method for the 2-D laminar flow of viscoelastic fluid past a square section of cylinder in a confined channel with a blockage ratio 1/4 for Re = 10-4, 5, 10 and 20. Oldroyd-B model (constant viscosity with elasticity) and the PTT model (shear-thinning with elasticity) are the constitutive models considered. In this study effects of the elasticity and inertia on the drag coefficients and stress fields around the square cylinder are obtained and discussed in detail. With an increase elasticity, drag coefficients get smaller due to stronger shear thinning effects for PTT fluid, however, the drag coefficients show slightly enhancement for the Oldroyd-B fluid.

Keywords: square cylinder, viscoelastic flow, PTT fluid, Oldroyd-B
Published online
2018-08-29
How to Cite
Tezel, G. B., Yapici, K. and Uludag, Y. (2019) “Flow Characterization of Viscoelastic Fluids around Square Obstacle”, Periodica Polytechnica Chemical Engineering, 63(1), pp. 246-257. doi: https://doi.org/10.3311/PPch.12426.
Section
Articles