Two-Phase Flow

Year
1

Academic year
2017-2018

Code
02029778

Subject Area
Mechanical Engineering Sciences

Language of Instruction
English

Mode of Delivery
Face-to-face

Duration
SEMESTRIAL

ECTS Credits
5.0

Type
Elective

Level
2nd Cycle Studies - Mestrado

Recommended Prerequisites

Not applicable.

Teaching Methods

Lectures including the solving of hand-picked case studies. The teaching methods will be supplemented by the use of various modern techniques, such as e.g. computer animation. A special emphasis will be placed on study workshops where the students will present their seminar papers. The laboratory exercises will be carried out in the computer classroom and in the experimental laboratory.

Learning Outcomes

The fundamental goal of this study course is to acquaint the students with the basic characteristics of twophase flows, with a special emphasis on liquid-gas (vapour) systems. The students will gain the ability to clearly and logically decompose the scales of complex technical systems from the viewpoint of two-phase flow. The subject matter is extremely important in a wide palette of traditional energy and process engineering disciplines, as well as for the new multi-disciplinary technologies in environmental science and mechatronics.

Work Placement(s)

Syllabus

1. Complex system: enforced, designed or created hierarchy, variable two-phase system structures.2.Laws of continuum physics for single-phase, single-component systems from the viewpoint of two-phase flow:laws of conservation; mechanistic approach, energy approach. Microfluidics:the advantages of using microsystems.The problems of modeling microsystems with two-phase flow: determination of viscous shear stress, slip at the wall, surface tension.3.Modeling two-phase flow-one-dimensional description:the model of homogeneous flow: transport equations, the friction factor; stratified flow model: pressure drop; drift flux model: the influence of gravity for negligible shear stresses. 4. Liquid and gas (vapor) systems: flow regimes, pressure drop, phase fraction, two-phase flow instability. Boiling.Condensation.Cavitation. 5.Gas and solid particle systems:flow regimes in transport by pipes for low concentrations of solid particles, slurry transport. Fluidization. Sedimentation.

Assessment Methods

Assessment
The exam consists of a written part and oral questioning (50%/50%). Laboratory work (100%). Overall grade is from exam/laboratory work (100%/100%).: 100.0%

Bibliography

[1] G.B. Wallis, One-dimensional Two-phase Flow, McGraw-Hill 1969.

[2] G. Hetsroni, Handbook of Multiphase Systems, Hemisphere, 1982– Selected chapters.

[3] C. E. Brennen: Fundamentals of Multiphase Flow, Cambridge University Press, 2005– Selected chapters.

[4] Crowe, C.T.: Multiphase Flows with Droplets and Particles. CRC Press, Boca Raton, Fla, 1998.

[5] J.R. Thome, Engineering Data Book III, Wolverine, eBook.

[6] B. J. Azzopardi, Gas-Liquid Flows, Digital Library, Begell House, eBook.