LEARNING OUTCOMES

The main objectives of the course are: to provide students with an in-depth study of the heat transfer principles; to study heat exchange phenomena in components and processes of particular interest for mechanical engineering; to introduce the main methodologies used in the thermal design of components and systems.

AIMS AND LEARNING OUTCOMES

On successful completion of this module, students should demonstrate:

• Knowledge and understanding of the heat transfer equations, including their application to complex problems, also in case of on combined heat transfer mechanisms;
• Ability to propose solutions to limit/enhance heat transfer in complex systems;
• Ability to select the most suitable numerical or analytical method for the solution of the heat transfer equations (dimensionless formulation, numerical methods).

PREREQUISITES

Bachelor level knowledge in heat transfer and thermodynamics is mandatory.

TEACHING METHODS

Lectures

SYLLABUS/CONTENT

HEAT CONDUCTION: General heat conduction equation; boundary and initial conditions; the thermal resistance concept; critical radius of insulation; heat transfer from finned surfaces; lumped system analysis; transient heat conduction in semi-infinite solids; finite difference formulation of differential equations in heat conduction.

HEAT CONVECTION: Fundamentals and preliminary analysis; conservation of mass equation; conservation of momentum equations: newtonian fluids and Navier-Stokes equations; conservation of energy equation; dimensionless forced convection equations and similarity; analogies between momentum and heat transfer; turbulence; Blasius solutions of convection equations for a flat plate; forced convection in tubes; natural convection: Boussinesq assumption; dimensionless natural convection equations.

THERMAL RADIATION: Fundamentals; blackbody and gray surfaces radiation; radiation heat transfer: black surfaces and diffuse, gray surfaces.

TWO-PHASE HEAT TRANSFER: Fundamentals of pool and flow boiling; Nusselt equation for condensation.

This unit contributes to the achievement of the following Sustainable Development Goals of the UN 2030 Agenda: 4. Quality Education, 7. Clean and Affordable Energy.

RECOMMENDED READING/BIBLIOGRAPHY

• Y. Cengel. Heat and Mass Transfer, Ed. McGrawHill, 2015.

• Incropera, DeWitt, Bergman, Lavine: Fundamentals of Heat and Mass Transfer, John Wiley and Sons, 2011
• A.Bejan, Heat Transfer, John Wiley and Sons, Inc, 1993