Transport Processes at Taylor Bubbles in Vertical Channels / Sven Kastens.

Format:

• Book

Author/Creator:

• Kastens, Sven, author.

Series:

• Berichte aus dem Institut für Mehrphasenströmungen
• Berichte aus dem Institut für Mehrphasenströmungen ; Volume 8

Language:

English

Subjects (All):

• Chemical apparatus.

Physical Description:

1 online resource (191 pages)

Edition:

First edition.

Place of Publication:

Göttingen : Cuvillier Verlag, [2021]

Summary:

Gas / liquid contact apparatuses are widely used in chemical, biochemical or pharmaceutical industry to provide and transfer gas species as reactant from the gaseous phase to pre-dissolved reactants in the liquid phase enabling a preferred reaction. The global and local transport are complex interlinked processes and therefore in practice in reactor design industry, mostly empirically correlated. For a secure control of the overall process and a more efficient reactor design, the local transport processes at gas / liquid interfaces need to be investigated in complexity reduced systems to be understood. Elongated bubbles, Taylor bubbles, in vertical channels 5.5 < D < 8 mm overcome the problem of dynamic shape deformation, complex 3D rise trajectories and they have a volume independent rise velocity, which make them the ideal experiment for reliable and reproducible investigations. Detailed optical measurements of global and local processes via high-speed Shadowgraphy, 2D2C PIV and p-2D LIF give new insights into the dependency of local bubble shape and global terminal rise velocity, establish a Sherwood correlation of shrinking CO2 bubbles in various channel sizes and shows the coupling of local transport phenomena at the bubble interface and the mixing in the wake region.

Contents:

• Intro
• Danksagung
• Table of contents
• List of figures
• List of tables
• Nomenclature
• Abstract
• Zusammenfassung
• Chapter 1 Introduction
• Chapter 2 State of the art and basic knowledge
• 2.1 Gas-liquid flows in channels
• 2.2 Transport processes in bubbly blows
• 2.3 Taylor bubbles
• 2.4 Conclusion, gap of knowledge &
• research goal
• Chapter 3 Experimental set-up and procedure
• 3.1 Experimental set-up
• 3.2 Visualization techniques &
• procedures
• 3.3 Procedures and experiments
• Chapter 4 Results and discussion
• 4.1 Investigation of global and local fluid dynamics of bubbles in channels
• 4.2 Investigation of global and local mass transfer processes at Taylor bubbles
• 4.3 Comparison of global and local measuring techniques - Bubble volume difference vs. the integration of concentration field
• 4.4 Influence of mixing on mass transfer and chemical reaction
• Chapter 5 Conclusion
• 5.1 Outlook
• References
• Appendix A General parameters and dimensionless numbers of the channels
• Appendix B Absorption and emission spectra of Fluorescein
• Appendix C Settings for PIV and LIF equipment and post processing
• Appendix D Global mass transfer processes of Taylor bubbles in aqueous fluorescein solution
• Appendix E Local fluid dynamics at Taylor bubble front kept in CCF in circular channel D = 6 mm
• Appendix F Local fluid dynamics at small bubble kept in CCF in square channel Dh = 6 mm
• Appendix G Taylor bubbles wakelength lwake = f (ν) in square channel Dh = 6 mm
• Appendix H Local fluid dynamics at clean and contaminated Taylor bubbles in circular channel D = 6 mm
• Appendix I Curriculum Vitae.

Notes:

• Description based on publisher supplied metadata and other sources.
• Description based on print version record.
• Includes bibliographical references.

ISBN:

• 9783736964044
• 3736964048

OCLC:

1247661693