Fundamentals of Multiphase Flows

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Note: The number of participants is restricted. Therefore, please register for this course. Only the registration for the lecture is of relevance. The registration for the exercise just serves to complete your personal schedule.

After successful attendance of this module, the students know the substantial phenomena occurring in multi-phase flows. Additionally they are able to model these phenomena by means of the fundamental equations of thermo-fluiddynamics and have developed corresponding problem-solving competences. With the seminar talks, the student learn how to work with scientific publications in order to get acquainted with new subject. The material presented in the course will be expanded and/or deepened. Moreover, the students learn how to devise and present a talk.

Gas-Liquid Mixtures (Gas-Flüssigkeitsgemische) are of paramount importance for energy and process-technology, consider e.g. fuel sprays in Diesel engines or gas turbines, boiling of water in the steam generator of a power plant, or the distribution of air bubbles in aerated stirred reactors or bubble columns. A selection of physically interesting as well as technically relevant phenomena are discussed in this course. While technical applications are introduced frequently in an exemplary manner, the underlying physical laws, i.e. the conservation laws of mass, momentum and energy, form the main subject. It will be demonstrated that diverse phenomena can be explained and described quantitatively in this unified framework, which represents the core of Thermo-Fluiddynamics. Special emphasis is placed on instabilities and heat addition in two-phase flows. Example problems will be solved and discussed in the tutorials (Übungen) in order to deepen the understanding of the phenomena presented in the lecture and to hone problem-solving skills. Students who want to earn 5 ECTS (Vertiefungsfach) must prepare and present a short talk (15 min). The individual topics will be defined after consultation with the lecturer, and must o course have a relation to multi-phase flows. Speakers will get support on how to prepare and present a talk, including a general introduction to presentation methods and style by the Center of Key Competencies (ZSK), as well as the opportunity to rehearse their presentation at the ZSK and receive feedback.

Previous knowledge in fluid mechanics as well as in heat and mass transfer is assumed.

Students who want to earn 5 ECTS (Vertiefungsfach) must prepare and present a short talk (15 min). The individual topics will be defined after consultation with the lecturer, and must o course have a relation to multi-phase flows. Speakers will get support on how to prepare and present a talk, including a general introduction to presentation methods and style by the Center of Key Competencies (ZSK), as well as the opportunity to rehearse their presentation at the ZSK and receive feedback. Further information is provided in the first lecture.

Written exam (90 minutes, with documentation), or oral exam (depending on the number of participants). Seminar presentations are analyzed and evaluated after a feedback round with the other students in individual discussions. If GMS is taken as a specialization subject, the evaluation of the seminar presentation will be included in the overall grade.

Liquid-Vapor Phase-Change Phenomena V. P. Carey, Taylor & Francis (1992) Bubbles, Drops, and Particles R. Clift, J. R. Grace and M. E. Weber, Academic Press, New York (1978) Multiphase Flows with Droplets and Particles C. Crowe, M. Sommerfeld and Y. Tsuji, CRC Press (1998) Bubble Dynamics and Cavitation M. S. Plesset and A. Prosperetti, Ann. Rev. Fluid Mech, 9 pp. 145-185 (1977) Wärmeübertragung W. Polifke und J. Kopitz, Pearson Education, München (2005) Strömung und Wärmeübergang in Gas - Flüssigkeits - Gemischen F. Mayinger, Springer, Wien (1982)