LEARNING OUTCOMES

The main objective of the course are: -To provide an advanced knowledge of the main principles of heat transfer; -To study heat transfer phenomena involved in applications and processes of interest for the mechanical engineering; -To illustrate the principles of heat transfer design of processes and components.

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).

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