Energy and Mass Transfer

Code: EME10987L

6 ECTS

Duration: 15 weeks/156 hours

Scientific Area: Mechanical Engineering

Teaching languages: Portuguese

Languages of tutoring support: Portuguese, English

Regime de Frequência: Presencial

Presentation

Contents related to heat transfer through conduction, convection and radiation are taught and the analogy between mass and heat transfer is presented, which are fundamental to understand this type of process in nature and in engineering equipment and systems.

Sustainable Development Goals

Educação de qualidade - Assegurar a educação inclusiva, e equitativa e de qualidade, e promover oportunidades de aprendizagem ao longo da vida para todos.

Energias renováveis e acessíveis - Garantir acesso à energia barata, confiável, sustentável e renovável para todos.

Learning Goals

Know the fundamentals of heat transfer processes by conduction, convection and radiation and know how to use solution methods in practical engineering cases. Know how to establish the fundamental equations and respective boundary conditions in the analysis of practical cases of heat transfer. Know and apply analytical and numerical solution methods. Know the methods of analysis of heat exchangers and heat sinks and how to use them. Know the fundamental concepts of mass transfer and the analogy between heat and mass transfer.

1. Fundamentals of heat transfer. Conduction, convection and radiation.
2. Heat diffusion equation. Unidimensional heat conduction in steady state regime. Extended surfaces. Multidimensional heat conduction. Transient conduction and in media with internal heat generation. Analytical solutions and numerical methods.
3. Hydrodynamic and thermal boundary layers. Forced convection in internal and external flows in laminar and turbulent regimes. Calculation of the heat transfer coefficient for different geometries. Natural convection.
4. Heat exchangers. Method of the logarithmic mean temperature difference and effectiveness method (epsilon-NTU). Analysis of heat sinks.
5. Radiative properties of surfaces. Black bodies and real bodies. Planck's Law. Stefan-Boltzmann and Wien Laws. Kirchhoff's Law. Radiative exchange between surfaces. View factors. Calculation methods.
6. Fundamental concepts of mass transfer and analogy with heat transfer.

Teaching Methods

The course is organized in theoretical and theoretical-practical classes. Theoretical classes are for the presentation of the theory and solution methods. Theoretical-practical classes are for the problem solution, development and use of numerical methods and analysis of experimental results in practical applications and laboratorial tests. In this last aspect of the theoretical-practical classes, the diversification of the teaching methodology stands out through the challenge to students to carry out a project/practical work, namely the use numerical methods to solve heat transfer problems. This project/practical work will be valued in a component of continuous evaluation and can be carried out in groups of a maximum of three students, thus also promoting collaborative work.

Assessment

There will be an evaluation system that consists of:
Continuous evaluation:
- Two tests (T1 and T2) and a report of a practical work (R); or
Final evaluation:
- Final exam (Ex).

The minimum mark for the continuous evaluation components (T1, T2 and R) is 8.0 points.

The final classification is calculated using NF = 0.35*T1 + 0.35*T2 + 0.30*R in the case of continuous evaluation and NF = Ex in the case of final evaluation.

The minimum final grade to be approved is 10 points.