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 &amp

research goal

Chapter 3 Experimental set-up and procedure

3.1 Experimental set-up

3.2 Visualization techniques &amp

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