Next Article in Journal
Natural Gas Consumption Forecasting Based on the Variability of External Meteorological Factors Using Machine Learning Algorithms
Previous Article in Journal
Numerical Analysis of Thermal Stress for a Stack of Planar Solid Oxide Fuel Cells
Previous Article in Special Issue
Oxygen Transfer Effects in a Two-Phase System of an Aqueous Phase and Liquid Perfluorochemical Subjected to Continuous Wave-Assisted Agitation in Disposable Bioreactor
 
 
Article

Gas Hold-Up and Mass Transfer in a Vessel with an Unsteady Rotating Concave Blade Impeller

Division of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Moghtada Mobedi
Energies 2022, 15(1), 346; https://doi.org/10.3390/en15010346
Received: 8 November 2021 / Revised: 13 December 2021 / Accepted: 1 January 2022 / Published: 4 January 2022
(This article belongs to the Special Issue Multiphase Flows)
The steady mixing of gas-liquid systems is used where a large development of the interfacial area is required. However, the presence of gas in the liquid reduces the efficiency of mass transfer by reducing the mixing power, due to the creation of gas formations behind the impeller blades and the reduction in density. The efficiency of mass transfer can be increased by using a concave blade impeller or unsteady mixing. Mass transfer efficiency studies for these impellers and unsteady mixing are limited. This paper presents an analysis of the influence of the impeller construction on the gas hold-up and volumetric mass transfer coefficient kLa. Impellers with a different number of concave blades, and with alternatively arranged concave blades, were analyzed. The obtained results were compared with the standard flat blade turbine. The obtained results indicate that the arrangement of the concave blades has the greatest effect on reducing the gas hold-up and kLa. Higher values were obtained for the four-bladed and six-bladed impellers. A comparison of the gas hold-up rate for the unsteady and steady mixing has shown that for steady mixing greater gas hold-up is achieved. The volumetric mass transfer coefficient for unsteady mixing is also greater compared to steady mixing, indicating greater efficiency in mass transfer. View Full-Text
Keywords: mixing; unsteady mixing; gas-liquid; gas hold-up; mass transfer mixing; unsteady mixing; gas-liquid; gas hold-up; mass transfer
Show Figures

Figure 1

MDPI and ACS Style

Frankiewicz, S.; Woziwodzki, S. Gas Hold-Up and Mass Transfer in a Vessel with an Unsteady Rotating Concave Blade Impeller. Energies 2022, 15, 346. https://doi.org/10.3390/en15010346

AMA Style

Frankiewicz S, Woziwodzki S. Gas Hold-Up and Mass Transfer in a Vessel with an Unsteady Rotating Concave Blade Impeller. Energies. 2022; 15(1):346. https://doi.org/10.3390/en15010346

Chicago/Turabian Style

Frankiewicz, Sebastian, and Szymon Woziwodzki. 2022. "Gas Hold-Up and Mass Transfer in a Vessel with an Unsteady Rotating Concave Blade Impeller" Energies 15, no. 1: 346. https://doi.org/10.3390/en15010346

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

Article Access Map by Country/Region

1
Back to TopTop