Duration
30h Th
Number of credits
| Master in chemistry (120 ECTS) | 3 crédits |
Lecturer
Language(s) of instruction
English language
Organisation and examination
Teaching in the second semester
Schedule
Units courses prerequisite and corequisite
Prerequisite or corequisite units are presented within each program
Learning unit contents
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
Learning outcomes of the learning unit
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
Prerequisite knowledge and skills
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).
Planned learning activities and teaching methods
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.
Mode of delivery (face to face, distance learning, hybrid learning)
Face-to-face course
Additional information:
If the conditions permit, the course will be held as face-to-face course. In case individual lectures cannot be held face-to-face, a video of the lecture content will be offered.
Recommended or required readings
The course material is available on the eCampus website.
Exam(s) in session
Any session
- In-person
written exam ( open-ended questions ) AND oral exam
- Remote
oral exam
Written work / report
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.
If the lab session will not be realized in person, the lab report is nevertheless mandatory, for which experimental data will be supplied.
A written exam is organized during the first session in June. The written exam consists of exercise problems to be solved, which are similar to those presented during exercise sessions. The exam additionally contains questions on understanding. It is a closed-book exam. Students receive a formulary with all relevant equations.
The overall grade is a weighted average of the grades obtained at the written exam (80 %) and the lab grade (including report and entrance test) (20 %), where the entrance test contributes 20 % and the report 80 % of the lab grade.
The second session exam is organized in the same way as in June. The mark obtained for the laboratory report is maintained.
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.
Work placement(s)
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Organisational remarks and main changes to the course
The course will be presented in English.
The course is organized during the second quadrimester.
Contacts
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