Transmissão de Calor

Objectives

Highlight the relevance of heat transfer phenomena. Write the equations and boundary conditions, as well as simplifying assumptions, needed to solve typical conduction, convective and radiative transfer problems. Describe solution methods to solve those problems using practical engineering examples by means of approximate or rigorous methods.

Syllabus

Heat transfer modes and mechanisms. Fundamentals laws of conduction, convection and radiation. Fundamentals concepts of heat conduction. Heat conduction equation. One dimensional conduction. Extended surfaces. Unsteady heat conduction. Bodies with negligible spatial thermal gradients. Semi- infinite solids. Bodies with internal spatial thermal gradients. Fundamental concepts of convection. Forced convection in external flows and internal flows and free convection. Empirical correlations for several geometries. Heat exchangers: type and functions. Global heat transfer coefficient. Logarithmic mean temperature difference and epsilon-NTU methods. Thermal radiation: fundamental concepts. Radiative properties of surfaces. Black and grey bodies. Planck, Stefan-Boltzmann, Wien and Kirchhoff laws. Shape factors. Heat exchange between diffuse surfaces in non-participating media.

Prerequisites

Thermodynamics I, Thermodynamics II, Fluid Mechanics I, Fluid Mechanics II.

Cross Competence Component

Interpersonal skils (teamwork).

Laboratorial Component

Experimental work about conduction or convection with assessment of a writen report.

Programming And Computing Component

Computational works using dedicated software.

Ethical Principles

All members of a group are responsible for the group’s work In any assessment, every student shall honestly disclose any help received and sources used. In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.