SubjectsSubjects(version: 877)
Course, academic year 2020/2021
Bubbles, drops and particles - AP409007
Title: Bubbles, drops and particles
Guaranteed by: Department of Chemical Engineering (409)
Actual: from 2019
Semester: summer
Points: summer s.:0
E-Credits: summer s.:0
Examination process: summer s.:
Hours per week, examination: summer s.:3/0 other [hours/week]
Capacity: unknown / unknown (unknown)
Min. number of students: unlimited
Language: English
Teaching methods: full-time
For type: doctoral
Note: course is intended for doctoral students only
can be fulfilled in the future
Guarantor: Tihon Jaroslav Ing. CSc.
Interchangeability : D409015, P409007
Annotation -
Last update: Pátková Vlasta (16.11.2018)
The subject broadens knowledge of chemical engineering in the direction towards multiphase systems dealing with bubble, drops, and particles. Hydrostatics and hydrodynamics of multiphase systems, where interfacial tension plays the dominant role, are not usually sufficiently accented in the basic courses, even if tasks connected with these topics are very often solved in chemical engineering applications. Firstly, opening lectures explain the basic principles of fluid mechanics: transport equations, material derivations, deformation and strain tensors, equations of motion and boundary conditions. After that different forces acting on fluid particles are analyzed and the dimensionless number balancing all these forces defined. On the base of this knowledge, hydrodynamic behavior of bubbles and drops is discussed, including questions connected with the shape of individual fluid particles. Then the phenomena related to the capillarity, surface wettability, contact angle formation, surfactants effects, or mass/heat transport between a particle and surrounding fluid are shortly treated. Finally, suspensions, emulsions, foams, and liquids films are characterized, including their multiphase rheology and accompanying phenomena of particle coalescence, breakup, or flocculation. The subject is lectured and finished with a final oral examination.
Aim of the course -
Last update: Pátková Vlasta (16.11.2018)

Students will widen their knowledge of fluid mechanics and apprehend physical-chemical processes controlling behavior of multiphase systems. Acquired knowledge will be applicable both in scientific experiments and engineering practice dealing with bubble, drops, and particles.

Literature -
Last update: Pátková Vlasta (16.11.2018)

1. Clift R., Grace J.R., Weber M.E. : Bubbls, drops, and particules. Dover publications, inc. Mineola, NewYork (2005)

2. DeGennes P.G., Brochard-Wyart F., Quéré D.: Capillarity and Wetting Phenomana. Springer New York (2004)

3. Guyon E., Hulin J.-P., Petit L., Mitescu C.D. : Physical hydrodynamics. Oxford University Press, Oxford (2001)

Learning resources -
Last update: Pátková Vlasta (16.11.2018)

Texts of the lectures are at disposal.

Syllabus -
Last update: Pátková Vlasta (16.11.2018)

1. Basic principles of fluid mechanics

2. Forces acting on rigid and fluid particles

3. Dimensionless numbers in hydrodynamics of fluid particles

4. Flow around rigid particles, shape classification of rigid particles

5. Motion of fluid particles, shape of bubbles and drops

6. Surface and interfacial tension, capillary phenomena

7. Surface wettability, static and dynamic contact angle

8. Liquid film flow, its stability and wave inception

9. Shape oscillations of fluid particles

10. Surfactants

11. Suspensions, emulsions, foams

12. Interfacial phenomena, coalescence and breakup

13. Rheology of multiphase systems.