Complementos de Transmissão de Calor

Objectives

Describe the physical mechanisms of radiative emission, radiative absorption and scattering. Introduce the radiative transfer equation. Describe computational methods to solve radiative heat transfer problems in participating media. Present the radiative properties of gases and particles and describe simple methods to estimate these properties. Present the fundamentals of heat transfer with phase change. Describe the physical mechanisms and present empirical correlations to estimate the convective heat transfer coefficient in processes of pool boiling, forced boiling, film condensation and dropwise condensation. Present the fundamentals of heat transfer in porous media. Introduce the macroscopic transport equations in porous media. Define effective properties of porous media and present methods to estimate them. Introduce the fundamental concepts of heat exchangers design, the fundamentals of compact heat exchangers and heat transfer augmentation.

Syllabus

Thermal radiation in participating media. Emission, absorption and scattering. Radiative transfer equation. Numerical methods. Radiative properties of gases: fundamentals. Line-by-line, band models and global models: an overview. Hottel charts and Leckner´s correlations. Radiative properties of particles: fundamentals. Mie theory. Simplified theories. Boiling modes. Forced convection and pool boiling: physical mechanisms and empirical correlations. Film and dropwise condensation: physical mechanisms and empirical correlations. Heat transfer in porous media. Morphological characterization. Flow regimes and Darcy-Forchheimer law. Macroscopic transport equations. Effective properties of porous media. Heat exchangers design, pressure drop and pumping power. Fouling. Compact heat exchangers. Heat transfer augmentation.

Prerequisites

Thermodynamics I, Thermodynamics II, Fluid Mechanics I, Fluid Mechanics II, Heat Transfer.

Cross Competence Component

Interpersonal skills (teamwork).

Laboratorial Component

Laboratorial work about boiling or condensation.

Programming And Computing Component

Computacional work requiring programming or use of commercial 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.