Transport phenomena

Part A

This course presents an analysis of the transport phenomena at the basis of chemical engineering with the focus on heat and mass transfer.

• Definitions of extensive and intensive properties. Concepts of mass, momentum, and energy balance equations.
• Molecular basis for heat and mass transfer. Similarity between both.
• Energy-balance equation. Conductive and radiative contributions. Fourier's law: thermal conductivity. Stefan-Boltzmann's law: Stefan-Boltzmann constant, emissivity. Conductive stationary heat transfer: heat transfer coefficient. Conductive transient heat transfer: Fourier's number.
• Mass balances. Relative displacement flux, diffusional flux. Fick's and Maxwell-Stefan law, different molecular diffusion coefficients. Transient mass transfer. Quasi-stationary mass transfer: mass-transfer coefficient.
• Convective heat and mass transfer. Stagnant-film model, surface-renewal theory, penetration theory, two-film theory. Dimensionless numbers. Correlations of mass-transfer coefficients.
• Instabilities at interfaces induced by mass transfer.

• Dimensionless quantities

Part B

The entire course presents an analysis of the transport phenomena at the basis of chemical engineering with the focus on heat and mass transfer. For chemical engineers the following parts are formally grouped in this section of the lecture:

• lecture and exercise sessions on dimensionless quantities
• laboratory sessions

Part A

At the end of the course, students understand and will be able to apply theoretical concepts and the analysis methodology of transport phenomena, especially heat and mass transfer. They will be able to use these concepts to describe mathematically simple experimental systems. They will be able to use the formalism of mass and heat transfer coefficient.
Students will be able to link investigated phenomena to their mathematical representation and justify main simplifications adopted to develop the model

Part B

Specified in the course description for CHIM0022-A-c.

Part A

The courses "Chemistry" (CHIM0603-1), "Eléments de thermodynamique" CHIM0286-1, and "Elements of fluid mechanics" (MECA0011-2) (or courses with similar contents) should have been attended during previous years (or they should be attended the same year).

Part B

Specified in the course description for CHIM0022-A-c.

Part A

For chemical engineers the course is based on ex-cathedra lectures,  exercises sessions, and a lab, which is realized formally as courses CHIM0022-A-c & CHIM0022-B-a. For chemists the lectures do not include the section on dimensionless quantities and the lab is not required, which is formally realized as course CHIM0022-A-c. The detailed schedule will be presented during the first lecture.
The lectures are dedicated to the detailed description of the fundamental concepts necessary for the analysis and mathematical representation of transport phenomena.
During exercise sessions students learn how to solve problems related to heat and mass-transport phenomena.
In the lab session some standard experimental methods are introduced. During laboratory sessions, students work in small teams. They have the opportunity to get familiar with experimental measurement techniques of fluid transfer properties.
Participation to laboratory sessions is mandatory for chemical engineers. The sessions have to be prepared by carefully reading the corresponding laboratory notes, which will be checked by an entrance test. If the entrance test is not passed, access to the laboratory sessions may be denied. A report, which will be graded, has to be submitted after the lab at a deadline specified in the lab notes.
If it is not possible to realize the lab sessions in person, the equipment will be presented via video, original experimental readings will be supplied as basis for the preparation of the lab report.

Part B

Specified in the course description for CHIM0022-A-c.

Part A

Face-to-face, the course can be organized via video, where regular online-discussion sessions will be offered.

Part B

Specified in the course description for CHIM0022-A-c.

Part A

For code yellow and orange the options for teaching and exams are mentioned in the corresponding sections.
The lectures are offered via distance learning as podcast videos with regular opportunities to contact the lecturer in bi-weekly Lifesize meetings for Q&A-sessions, which start at the planned lecture time. The corresponding dates are communicated in the first lecture.
The lab is canceled, instead a video will be made available, which shows the equipment. For the reports, experimental readings will be supplied, which are to be evaluated. Otherwise all other regulations apply.
The exams will be organized as oral exams via Lifesize.

Part B

Specified in the course description for CHIM0022-A-c.

Part A

The course material is available on the eCampus website.

Part B

Specified in the course description for CHIM0022-A-c.

Part A

Any session :

- In-person

written exam ( open-ended questions )

- Remote

oral exam

- If evaluation in "hybrid"

preferred remote


Additional information:

Participation to lab and the report are mandatory to pass the exam. At the beginning of the lab an entrance test will be condcuted to validate the ability of the student to properly handle the lab equipment.
A report of the laboratory sessions must be provided by the students within 2 weeks after these sessions. This report must present the obtained experimental results, their critical analysis, as well as answers to the questions presented in the laboratory notes. The deadline for delivering the report will also be included explicitly in the lab instructions. If the report is not received by the deadline indicated, it is graded as 0 points.
A written exam is organized during the first session in June.
If the lab session will not be realized in person, the lab report is nevertheless mandatory. In case written exams are still complicated via COVID-19, oral online exams will be realized.
The second session exam is organized in the same way as in June.
The written exam consists of exercise problems to be solved, which are similar to those presented during exercise sessions.
It is a closed-book exam. Students receive a formulary with all relevant equations.
The global grade is a weighted average of the grades obtained at the written exam (80 %) and the laboratory (including report and entrance test) (20 %).
Both exams may be oral, if the number of students is 5 or less. In case of oral exams, the exam can be held via video conference.

Part B

Any session :

- In-person

written exam ( open-ended questions )

- Remote

oral exam

- If evaluation in "hybrid"

preferred remote


Additional information:

Specified in the course description for CHIM0022-A-c.

Part A

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Part B

Specified in the course description for CHIM0022-A-c.

Part A

The course will be presented in English.
The course is organized during the second quadrimester.

Part B

Specified in the course description for CHIM0022-A-c.

Part A

Andreas Pfennig PEPs - Products, Environment, and Processes Department of Chemical Engineering University of Liège Quartier Agora, Allée du six Aout 11, Bâtiment B6c, office 1/66 phone: +32 4 366-3521 e-mail: andreas.pfennig@uliege.be www.chemeng.uliege.be/Pfennig  

Part B

Andreas Pfennig PEPs - Products, Environment, and Processes Department of Chemical Engineering University of Liège Quartier Agora, Allée du six Aout 11, Bâtiment B6c, office 1/66 phone: +32 4 366-3521 e-mail: andreas.pfennig@uliege.be www.chemeng.uliege.be/Pfennig