Next Article in Journal / Special Issue
Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns
Previous Article in Journal
Glycine Oligomerization by Pulsed Discharge Plasma over Aqueous Solution under Atmospheric Pressure
Previous Article in Special Issue
Study of Bubble Size, Void Fraction, and Mass Transport in a Bubble Column under High Amplitude Vibration
Article Menu
Issue 2 (June) cover image

Export Article

Open AccessArticle
ChemEngineering 2018, 2(2), 18; https://doi.org/10.3390/chemengineering2020018

The Bubble Shape in Contaminated Bubbly Flows: Results for Different NaCl Concentrations in Purified Water

1
Helmholtz-Zentrum Dresden—Rossendorf e. V. Institute of Fluid Dynamics, 01314 Dresden, Germany
2
Department of Energy, Politecnico di Milano, Via Lambruschini 4a, 20156 Milano, Italy
*
Authors to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 5 April 2018 / Accepted: 11 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Bubble Column Fluid Dynamics)
Full-Text   |   PDF [4416 KB, uploaded 3 May 2018]   |  

Abstract

The bubble shape influences the transfer of momentum and heat/mass between the bubble and the surrounding fluid as well as the flow field around the bubble. The shape is determined by the interaction of the fluid field in the bubble, the physics on the surface, and the surrounding flow field. It is well known that contaminations can disturb the surface physics so that the bubble shape can be influenced. Indeed, an influence of sodium chloride (NaCl) on the hydrodynamics of bubbly flows was shown for air/water systems in previous studies. The aim of the present work is to investigate if, and to what extent, the NaCl concentration affects the bubble shape in bubble columns. For this purpose, several experiments at the Helmholtz-Zentrum Dresden-Rossendorf and at the pilot-scale bubble column at the Politecnico di Milano are evaluated. The experiments were executed independently from each other and were evaluated with different methods. All experiments show that the bubble shape is not distinctly affected in the examined concentration range from 0 to 1 M NaCl, which is in contrast to a previous study on single bubbles. Therefore, the effect of NaCl on the hydrodynamics of bubbly flows is not induced by the bubble shape. View Full-Text
Keywords: bubble column; contaminations; surfactants; optical measurement; pilot-plant scale; nuclear safety engineering; sodium chloride bubble column; contaminations; surfactants; optical measurement; pilot-plant scale; nuclear safety engineering; sodium chloride
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Ziegenhein, T.; Lucas, D.; Besagni, G.; Inzoli, F. The Bubble Shape in Contaminated Bubbly Flows: Results for Different NaCl Concentrations in Purified Water. ChemEngineering 2018, 2, 18.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
ChemEngineering EISSN 2305-7084 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top