Tuccillo, Teresa (2009) Migration of a single particle suspended in non-Newtonian fluid. [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: Migration of a single particle suspended in non-Newtonian fluid
Creators:
CreatorsEmail
Tuccillo, Teresateresa.tuccillo@unina.it
Date: October 2009
Number of Pages: 80
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria chimica
Doctoral School: Ingegneria industriale
PHD name: Ingegneria chimica
PHD cycle: 22
PHD Coordinator:
nameemail
Maffettone, Pier Lucap.maffettone@unina.it
Tutor:
nameemail
Maffettone, Pier Lucap.maffettone@unina.it
Date: October 2009
Number of Pages: 80
Uncontrolled Keywords: non-Newtonian fluid, Migration, suspensions, Finite element method
MIUR S.S.D.: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/26 - Teoria dello sviluppo dei processi chimici
Date Deposited: 20 May 2010 12:59
Last Modified: 30 Apr 2014 19:38
URI: http://www.fedoa.unina.it/id/eprint/3846

Abstract

In this thesis we study the motion of a 2D single, solid particle suspended in a viscoelastic fluid. We perform simulations by means of a finite elements method method. An ALE particle mover is combined with a DEVSS-G/SUPG formulation together with a log-representation of the conformation tensor, in order to easily manage the particle motion and significantly improve numerical convergence at finite Deborah numbers. Finally, the rigid-body motion on the particle boundary is imposed through Lagrange multipliers. First we will show that the particle moves towards a wall if immersed in a non-Newtonian fluid under continuous shear flow, in qualitative agreement with experimental findings. Anyway most of the experiments are performed under oscillatory shear flow, so we will study the effect of oscillation on the migration of the particle and we will compare our results with experimental data. Finally we will report results of migration when particle is moving between two concentric rotating cylinders. We will show that the migration is strongly affected by the curvature of the two cylinders. We will also show the effect of the suspending fluid and the particle size.

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