scholarly journals Oxygen Mass Transfer in an Aerated Stirred Tank with Double Impellers: A Generalized Correlation Including Spacing Impact

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Hayder Mohammed Issa
Keyword(s):  
Mass Transfer ◽  
Food Industry ◽  
Oxygen Mass Transfer ◽  
Biological Processes ◽  
Industrial Equipment ◽  
Correlation Model ◽  
Design Factor ◽  
Dependent Parameter ◽  
Pharmaceutical Production ◽  
Generalized Correlation

Stirred aerated tanks by double impellers are used in fermentation and various biological processes for water treatment, food industry, and pharmaceutical production. In this study, a generalized correlation model was developed for the dependent parameter (kla/N). The oxygen mass transfer from air to liquid takes place by rotating the double impellers (IBRC and PBPU) in the aerated tank. This model considers Reynolds number, Froude number, power number, the liquid height, and the spacing between impellers as the most significant specifications that are related to aerated tank performance. The spacing between the impellers is considered to be a design factor of such industrial equipment due to its remarkable impact on the oxygen mass transfer.

scholarly journals Power Consumption, Mixing Time, and Oxygen Mass Transfer in a Gas-Liquid Contactor Stirred with a Dual Impeller for Different Spacing

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Hayder Mohammed Issa
Keyword(s):  
Mass Transfer ◽  
Power Consumption ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Mixing Time ◽  
Oxygen Mass Transfer ◽  
System A ◽  
Phase Water ◽  
Pharmaceutical Production ◽  
Slight Alteration

Multiple or dual impellers are widely implemented in stirred contactors used in various biological processes like fermentation, water treatment, and pharmaceutical production. The spacing between impellers is considered as a crucial factor in designing of these types of contactors resulting in variation of oxygen mass transfer, mixing time, or power consumption for such biological system. A study of three parts was conducted to characterize the effect of the spacing between impellers on the most important parameters that related to biological contactor performance: oxygen mass transfer coefficientklafrom the gas phase (air) to the liquid phase (water), mixing time, and power consumption for different operating rotational speeds (1.67–3.33 rps) and for three different spacing positions. The used impellers system in the study is a dual impeller system which consists of an inverted and bladed rotated cone (IBRC) and a pitched-blade up-flow propeller (PBPU). The experimental results showed that the shorter spacing (the lower PBPU in a higher position) is more convenient, as the achieved oxygen mass transfer coefficient has showed an improvement in its values with lower mixing time and with a slight alteration in power consumption.

scholarly journals Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 226
Author(s):  
Rashal Abed ◽  
Mohamed M. Hussein ◽  
Wael H. Ahmed ◽  
Sherif Abdou
Keyword(s):  
Mass Transfer ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Two Phase Flow ◽  
Oxygen Transfer Rate ◽  
Flow Patterns ◽  
Oxygen Mass Transfer ◽  
Phase Flow ◽  
Two Phase ◽  
Airlift Pump

Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture systems can be experimentally investigated to determine the pump aeration capabilities. The objective of this study is to evaluate the effects of various airflow rates as well as the injection methods on the oxygen transfer rate within a dual injector airlift pump system. Experiments were conducted using an airlift pump connected to a vertical pump riser within a recirculating system. Both two-phase flow patterns and the void fraction measurements were used to evaluate the dissolved oxygen mass transfer mechanism through the airlift pump. A dissolved oxygen (DO) sensor was used to determine the DO levels within the airlift pumping system at different operating conditions required by the pump. Flow visualization imaging and particle image velocimetry (PIV) measurements were performed in order to better understand the effects of the two-phase flow patterns on the aeration performance. It was found that the radial injection method reached the saturation point faster at lower airflow rates, whereas the axial method performed better as the airflow rates were increased. The standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) were calculated and were found to strongly depend on the injection method as well as the two-phase flow patterns in the pump riser.

Influence of pluronic F68 on oxygen mass transfer

2013 ◽  
Vol 29 (5) ◽  
pp. 1278-1288 ◽  
Author(s):  
Christian Sieblist ◽  
Marco Jenzsch ◽  
Michael Pohlscheidt
Keyword(s):  
Mass Transfer ◽  
Oxygen Mass Transfer ◽  
Pluronic F68

Oxygen mass transfer in three-phase fluidized beds working at large flow rates

1983 ◽  
Vol 61 (1) ◽  
pp. 58-63 ◽  
Author(s):  
M. Alvarez-Cuenca ◽  
C. G. J. Baker ◽  
M. A. Bergougnou ◽  
M. A. Nerenberg
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds ◽  
Oxygen Mass Transfer ◽  
Flow Rates ◽  
Three Phase ◽  
Large Flow
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