Læringsutbytte

A candidate who has passed the course will have a learning outcome in the form of acquired knowledge, skills, and general competence, as described below.

Knowledge

The candidate will:

• understand the meaning of the terminology associated with heat and mass transfer
• understand the physical principles associated with the subject
• be able to identify and distinguish between the three different heat transfer modes, ie conduction, convection, and radiation
• be able to define and explain the transfer rate equations applicable to heat and mass transfer
• be able to explain the main balance equations applicable to heat and mass transfer

Skills

The candidate will:

• be able to apply adequate methods, techniques and equations in solving heat and mass transfer problems
• be able to use provided input data for computing heat and mass transfer problems
• be able to look up data from available tables or handbooks, and use these data in solving heat and mass transfer problems
• be able to develop representative models of real processes and systems
• be able to draw conclusions concerning design or performance based on analysis of a process/system
• be able to work safely in the laboratory, in accordance with HES procedures

General competence

The candidate will:

• be able to communicate acquired knowledge in heat and mass transfer via technical report writing

Innhold

• Thermal conduction: Fourier’s law; Thermal conductivity; Heat diffusion equation; Steady-state conduction; Surface energy balance; Lumped capacitance method used in transient conduction; Thermal resistance; Contact resistance; Composite wall; Conduction in radial systems; Boundary conditions and initial conditions
• Convection: Newton’s cooling law; Velocity boundary layer; Thermal boundary layer; Concentration boundary layer; Friction coefficient; Local and average convection coefficients; Boundary layer approximations; Reynolds number; Laminary and turbulent flow; Laminar and turbulent boundary layers; Prandtl number; Nusselt number; Schmidt number; Sherwood number; Boundary layer analogies; Film temperature
• External convection: Empirical and theoretical models; The Blasius method; Mixed boundary layer conditions; Flow over flat plates, spheres, cylinders, and banks of tubes
• Internal convection: Hydrodynamic entry length; Velocity profile in circular tubes; Pressure drop in tubes; Moody diagram; Thermal entry length; Temperature profile in tubes; Flow in non-circular tubes
• Heat exchangers: Fouling; Fins; Overall heat transfer coefficient; LMTD-f method and NTU-e method; Heat exchanger laboratory task
• Thermal radiation: Irradiation, absorptivity, reflectivty, transmissivity, black body and emissivity; Emissive power; Stefan-Boltzmann equation; Kirchoff’s law; Shape factors; Absorbing gases; Characteristic mean beam length; Total emissivity of gases
• Free convection: Governing equations; Thermal expansion coefficient; Grashof number; Laminary and turbulent flow; Rayleigh number; Empirical and theoretical models; Ostrach method; Flow over vertical plates, inclined plates, horizontal plates, cylinders, spheres, channels, and enclosures; Comined free and forced convection; Free convection mass transfer
• Boiling and condensation: Boiling modes; Excess temperature; Pool boiling diagrams; Pool boiling correlations; Forced convection boiling; Film and droplet condensation
• Mass diffusion: Fick’s law; Absolute and relative mass fluxes; Stationary medium approximation; Species conservation equation; Raoult’s law; Henry’s law; Solubility
• Dimensional analysis: Dimensions and dimensionless numbers; Buckingham method
• Dimensioning of cylinder walls: Force balance; Stress-Strain diagrams; Stretch tension
• Introduction to transport and characteristics of particulate materials
• Process plant visit

Arbeids- og læringsformer

Lectures, exercises, assignments and laboratory work are used.

Lectures, including calculation examples and key derivations, are used to highlight the main topics of the course, facilitating knowledge.

The calculation examples (on the blackboard) are meant to inspire students to carry out their own activities. For this purpose exercises are given on a regular basis (basically one exercise per week), covering all main topics in the course, and incorporating the main methods and techniques used to solve heat and mass transfer problems. By working on the problems given in the exercises, the students will gain skills as well as knowledge (a higher level of comprehension).

During the semester, the students will also work on an assignment resulting in a report on a given heat and mass transfer subtopic. Through this the students will gain general competence in writing scientific reports, including how to cite and reference sources. The assignment will also contribute to knowledge (a deeper level of understanding) within one specific subtopic.

One laboratory task is given. When carrying out the laboratory work, the students will work in small groups. This will give the students general competence in the form of teamwork as well as report writing. In addition, they will gain more knowledge (by experiencing the physical processes in the lab) and skills (calculation methods) within one selected heat and mass transfer sub-topic.

Vurderingsformer

The final test counts 60 %; the mid-term test counts 25 %; the assignments counts 15 %. Grades A-F are used. To pass the course, the final test must be passed. The laboratory work is given on a pass/fail basis; to pass the course, the laboratory work must be passed.

The final test and the mid-term test are used to assess knowledge and skills. The assignment and the laboratory task are both used to assess knowledge, skills and general competence.

Det tas forbehold om mindre justeringer i planen.