Rheology of Materials

Teaching Methods

The teaching unit will be composed of theoretical classes, classes for resolution of problems and modelization and a strong laboratorial component. Evaluation will include tests, questionnaires related with the laboratorial classes and works made by the students outside the classroom. There will be a final examination for the students that don’t obtain approval by continuous evaluation.

Learning Outcomes

To recognize the importance of fluid viscoleasticity and the way it influences fluid deformation under shear and elongation;

To recognize the importance of non-zero normal stress differences in the viscoelastic materials and the way they may influence the rheological behavior and processing;

To understand the parameters that influence the rheological functions of polymers and other fluids;

To measure rheological properties of polymers and other materials and products, by resorting to appropriate equipments;

To fit the experimental results to appropriate models and extract relevant information from it;

To apply the understanding of the rheological behavior of a certain fluid to their processing conditions

 

Work Placement(s)

No

Syllabus

The concept of Rheology and the importance of its study

Viscoelasticity. Newtonian and non-Newtonian fluids. Shear and extensional viscosity. Linear viscoelasticity:

complex modulus and its components. Normal stress differences.

Apparatus for measuring rheological functions.

Non-Newtonian fluids, namely polymeric fluids: dependence on temperature, pressure molecular weight, etc.

Rheology of polymeric solutions.

Rheology of liquid crystalline polymers.

Rheology of polymer based composites. Influence of composition and processing conditions.

Rheology of suspensions with and without fibres added. Rheology of emulsions and plastisols.

Rheology of ceramic suspensions: Influence of the most relevant parameters in powder dispersebility and suspension viscosity.

Determination of pressure fall in shear flows.

Numerical modelling of non-Newtonian fluids flows.

Assessment Methods

Avaliação - Continua
Avaliação - Continua: 100.0%

Bibliography

[1] H.A. Barnes, J.F. Hutton and K. Walters, “An Introduction to Rheology”, Elsevier Publishers, 1989.

[2] R.B. Bird, R.C. Armstrong and O. Hassager, “Dynamics of Polymeric Liquids: Volume II, Fluid Mechanics”, John Wiley & Sons Inc., 1977.

[3] R.G. Larson, “The Structure and Rheology of Complex Fluids”, Oxford UniversityPress, 1999.

[4] J. Mewis, N. J. Wagner, “ Colloidal Suspension Rheology”, Cambridge University Press, 2012

[5] “Reologia e suas Aplicações Industriais”, A. Gomes de Castro, J.A. Covas e A. Correia Diogo (Eds), Ciência e Técnica (Instituto Piaget), 2001.

[6] K. Versteeg and W. Malalasekera, An Introduction to Computational Fluid Dynamics (2nd Ed), Prentice Hall, 2007.

[7] S.V. Patankar, "Numerical Heat Transfer and Fluid Flow", Hemisphere Pub, Bristol, 1982.