Flow Characterization of Viscoelastic Fluids around Square Obstacle

Download

index.pdf

Date

2019-01-01

Author

Tezel, Guler Bengusu
YAPICI, Kerim
Uludağ, Yusuf

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

209
views

155
downloads

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.

Subject Keywords

General Chemical Engineering, Square cylinder, Viscoelastic flow, PTT fluid, Oldroyd-B

URI

https://hdl.handle.net/11511/35938

Journal

PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING

DOI

https://doi.org/10.3311/ppch.12426

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Stress behavioursof viscoelastic flowaround square cylinder Tezel Tanrısever, Güler Bengüsu; Yapıcı, Kerim; Uludağ, Yusuf (2019-06-01) In this study, it is aimed the numerically investigation of the flow of liner PTT (Phan-Thien-Tanner) fluid, which is a viscoelastic fluid model over limited square obstacle by finite volume method. The finite volume method has been used for simultaneous solution of continuity, momentum and fluid model equations with appropriate boundary conditions. The effects of the inertia in terms of Reynolds number, Re, (0 < Re < 20) and the of elasticity in terms of Weissenberg number, We, (1 < We < 15) of PTT flow ...
MOTION OF A CIRCULATING POWER-LAW DROP TRANSLATING THROUGH NEWTONIAN FLUIDS AT INTERMEDIATE REYNOLDS NUMBERS Gürkan, Türker (Informa UK Limited, 1989-6) The equations of motion for the flow of a power-law fluid sphere in a Newtonian continuous phase have been approximately satisfied by Galerkin's method: External and internal stream functions have been obtained for the following ranges of variables: 10-50 for Re0, 0.1-1000 for the viscosity ratio parameters, X, and 0.6-1.0 for the dispersed phase power-law index, ni,. It is predicted that pseudoplasticity in the dispersed phase causes a reduction in the circulation within the drop and that it has a minor ef...
Numerical Analysis of Viscoelastic Fluids in Steady Pressure-Driven Channel Flow YAPICI, KERİM; Karasözen, Bülent; Uludağ, Yusuf (2012-05-01) The developing steady flow of Oldroyd-B and Phan-Thien-Tanner (PTT) fluids through a two-dimensional rectangular channel is investigated computationally by means of a finite volume technique incorporating uniform collocated grids. A second-order central difference scheme is employed to handle convective terms in the momentum equation, while viscoelastic stresses are approximated by a third-order accurate quadratic upstream interpolation for convective kinematics (QUICK) scheme. Momentum interpolation method...
Numerical simulation of radiating flows Karaismail, Ertan; Selçuk, Nevin; Department of Chemical Engineering (2005) Predictive accuracy of the previously developed coupled code for the solution of the time-dependent Navier-Stokes equations in conjunction with the radiative transfer equation was first assessed by applying it to the prediction of thermally radiating, hydrodynamically developed laminar pipe flow for which the numerical solution had been reported in the literature. The effect of radiation on flow and temperature fields was demonstrated for different values of conduction to radiation ratio. It was found that ...
THERMAL AND MASS DIFFUSIVITY FROM DYNAMIC SINGLE PELLET EXPERIMENTS DOGU, G; CABBAR, C; Doğu, Timur (Informa UK Limited, 1991-01-01) The single-pellet moment techniques previously developed for the evaluation of effective diffusion coefficient and effective thermal conductivity of a porous solid are combined and a procedure is proposed for the simultaneous evaluation of these constants from a single set of pulse response experiments. It is shown that both temperature and concentration response curves can be measured from a single pulse of oxygen injected into hydrogen carrier gas flowing past a catalyst pellet. It is shown that the zerot...

Citation Formats

G. B. Tezel, K. YAPICI, and Y. Uludağ, “Flow Characterization of Viscoelastic Fluids around Square Obstacle,” PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING, pp. 246–257, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35938.