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Heat and Mass Transmission

Code:

LTE21114

Sigla:

TCM

Áreas Científicas
Classificação	Área Científica
OFICIAL	Termodinâmca Aplicada

Ocorrência: 2021/2022 - 1S

Ativa?	Yes
Unidade Responsável:	Departamento de Engenharia Mecânica
Curso/CE Responsável:

Ciclos de Estudo/Cursos

Sigla	Nº de Estudantes	Plano de Estudos	Anos Curriculares	Créditos UCN	Créditos ECTS	Horas de Contacto	Horas Totais
LTE	22	Plano de Estudos	2	-	6	75	162

Língua de trabalho

Portuguese
Obs.: UC leccionada exclusivamente em Português

Objetivos

To supply to the basic knowledge and the processes of calculation of the methods of Heat Transfer: Conduction, Convection and Radiation.

Resultados de aprendizagem e competências

At the end of the course, the student will have to be capable of:

- Explain the bases of the heat and mass transfer.

- Calculate the heat flow for conduction in stationary regime and the distribution temperature in plane and cylindrical one-dimensional configurations with or without heat sources, as well as in finned surfaces.

- Calculate the temperature evolution, throughout the time and space, in simple configurations with and without internal gradients of temperature.

- Calculate the heat flow for natural and forced convection in simple configurations.

- Classify heat exchangers, to effect the calculation of functioning parameters and energy balances.

- Calculate the energy transfer between black surfaces and gray surfaces in simple configurations.

- Calculate the mass flow rate for basic conditions transference of mass and diffusion.

Modo de trabalho

Presencial

Programa

Introduction (Conduction Heat Transfer, Thermal conductivity, Convection Heat Transfer, Radiation Heat Transfer).

Conduction – (One dimension (the plane wall, insulation and R values, Radial systems, Overall Heat-transfer Coefficient, Critical Thickness Insulation, Heat-source systems, cylinder with heat-sources, condution-convection systems, fins, thermal contact resistance, lumped-heat-capacity system, transient heat flow in a semi-infinite solid, convection boundary conditions – Heisler charts)

Convection – (viscous flow, laminar layer, thermal boundary layer, turbulent boundary layer heat transfer, Reynolds, Prandtl and Nusselt numbers;  Empirical and Practical Relations for Forced-Convection Heat Transfer, pipe and tube flow,  flow across cylinders and spheres, flow across tube banks; Natural Convection systems, Grashof and Rayleigh numbers, empirical relations for free convection).

Heat exchangers (overall heat-transfer coefficient, fouling factor, types of heat exchangers, the log mean temperature difference, effectiveness-NTU Method).

Radiation Heat Transfer (physical mechanism, radiation properties, radiation shape factor, relations between shape factor, heat exchange between nonblackbodies.

Mass Transfer (Fick’s law of Diffusion, Diffusion in Gases, Diffusion in Liquid ans Solids, The mass-transfer coefficient).

Bibliografia Obrigatória

Yunus A. Çengel; Transferência de Calor e Massa - Uma abordagem prática, 3ª edição, Mc Graw Hill, 2009. ISBN: 978-85-7726-075-1

Bibliografia Complementar

Rui Figueiredo; Transmissão de calor - Fundamentos e Aplicações, LIDEL, 2015. ISBN: 978-972-757-983-9
Holman, J. P; Heat transfer, 9ª Edição, Mc Graw Hill, 2002. ISBN: 0-07-240655-0

Métodos de ensino e atividades de aprendizagem

The matter is presented in the theoretical-practical lessons and the concepts illustrated and tested in many exercises and laboratory work. The students equally make use of tests of preparation in the platform e-learning Moodle. The bibliography is also an important support, given its didactic nature, assertive with classes, with abundant examples and with a broad set of exercises to practice.

The curricular unit understands theoretical-practical lessons and the execution of laboratories works. The evaluation is based on one composed continuous component for 4 tests carried through in the lessons and for the appreciation of the reports of the laboratories, which allow to the approval and the dismissal of final examination.

Tipo de avaliação

Distributed evaluation without final exam

Componentes de Avaliação

Designation	Peso (%)
Teste	70,00
Trabalho laboratorial	30,00
Total:	100,00

Componentes de Ocupação

Designation	Tempo (Horas)
Estudo autónomo	87,00
Frequência das aulas	75,00
Total:	162,00

Obtenção de frequência

• Minimum final grade of 9.6 values.


• Minimum score on TP sheets of 9.6 values.


• Minimum laboratory grade of 9.6 values.

Fórmula de cálculo da classificação final

Final Grade: (TP)*70% + Lab*30%