Modeling Oxygen Mass Transfer Rate through the Air-Water Surface in Stratified Flows

2010 ◽  
Author(s):  
Zhiyong Duan ◽  
James L. Martin ◽  
Yong Tang
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Water Surface ◽  
Mass Transfer Rate ◽  
Stratified Flows ◽  
Oxygen Mass Transfer

Multiphase microreactors with intensification of oxygen mass transfer rate and mixing performance for bioprocess development

2018 ◽  
Vol 139 ◽  
pp. 57-67 ◽  
Author(s):  
Susanna Lladó Maldonado ◽  
Detlev Rasch ◽  
Alice Kasjanow ◽  
Dominique Bouwes ◽  
Ulrich Krühne ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Oxygen Mass Transfer ◽  
Bioprocess Development ◽  
Mixing Performance

Enhancement of oxygen mass transfer rate in the presence of nanosized particles

2007 ◽  
Vol 62 (24) ◽  
pp. 7391-7398 ◽  
Author(s):  
Endre Nagy ◽  
Tivadar Feczkó ◽  
Balázs Koroknai
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Oxygen Mass Transfer ◽  
Nanosized Particles

Numerical Study on Boiling Mechanism and Rapid Phase Transfer Phenomenon of LNG Discharging on Water

2012 ◽  
Vol 516-517 ◽  
pp. 97-106 ◽  
Author(s):  
Bin Zhang ◽  
Wan Qing Wu ◽  
Jian Wei Zhang
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Water Surface ◽  
Phase Transfer ◽  
Numerical Study ◽  
Mass Transfer Rate ◽  
Initial Time ◽  
Rapid Phase ◽  
Boiling Mechanism ◽  
Superheat Limit

Abstract. Aiming at analyzing boiling mechanism and confirming rapid phase Abstract. Aiming at analyzing boiling mechanism and confirming rapid phase transfer (RPT) taking place conditions of LNG discharging on water. The models of pool spreading, heat and mass transfer rate and LNG’s property are coupled in this paper. The conditions of RPT has been confirmed, which included LNG directly contacting with water and the water temperature should higher than LNG’s superheat limit temperature, but the RPT would not take place if the LNG boils on ice. The model of LNG discharging on water has been established in this paper, which is used to simulate Boe and Burro-9 experiments. The results showed that the models can simulate evaporation and boiling rate well, and can be used in predicting the initial time of RPT happening when the discharging process is calm and the location of discharging is near the water surface.

scholarly journals The effect of n-dodecane addition on oxygen transfer in stirred bioreactors for Saccharomyces cerevisiae broths

2005 ◽  
Vol 11 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Anca-Irina Galaction ◽  
Elena Folescu ◽  
Dan Cascaval
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Mass Transfer ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Considerable Increase ◽  
Mass Transfer Rate ◽  
Yeast Cells ◽  
Oxygen Mass Transfer ◽  
Oxygen Vector ◽  
Stirred Bioreactors

The previous works on simulated and P. shermanii broths were continued and developed for Saccharomyces cerevisiae broths. The obtained results indicated the considerable increase of k?a in the presence of n-dodecane as an oxygen-vector, but the magnitude of this effect had to be correlated with the biomass characteristics, especially with hydrophobicity. Due to the higher affinity of yeast cells for hydrocarbon droplets, increase of the oxygen mass transfer rate was lower than that recorded for simulated broths or bacterial suspensions.

Free Convective Mass Transfer at Isosceles Triangular Surfaces of Varying Inclination

2003 ◽  
Vol 68 (11) ◽  
pp. 2080-2092 ◽  
Author(s):  
Martin Keppert ◽  
Josef Krýsa ◽  
Anthony A. Wragg
Keyword(s):  
Mass Transfer ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Mass Transfer Process ◽  
Sulfate Solution ◽  
Convective Mass Transfer ◽  
Varying Length ◽  
Inclined Surface ◽  
Vertical Case ◽  
Limiting Diffusion Current

The limiting diffusion current technique was used for investigation of free convective mass transfer at down-pointing up-facing isosceles triangular surfaces of varying length and inclination. As the mass transfer process, copper deposition from acidified copper(II) sulfate solution was used. It was found that the mass transfer rate increases with inclination from the vertical to the horizontal position and decreases with length of inclined surface. Correlation equations for 7 angles from 0 to 90° were found. The exponent in the ShL-RaL correlation ranged from 0.247 for the vertical case, indicating laminar flow, to 0.32 for inclinations of 60 to 90°, indicating mixed or turbulent flow. The general correlation ShL = 0.358(RaL sin θ)0.30 for the RaL sin θ range from 7 × 106 to 2 × 1011 and inclination range from 15 to 90° was obtained.

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.

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