Effect of number of turbine impellers on surface aeration in laboratory fermentor

1989 ◽  
Vol 34 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Vlada Veljkovi? ◽  
Dejan Skala
Keyword(s):  
Surface Aeration ◽  
Laboratory Fermentor

Free Level Effect on the Impeller Power Input in Baffled Tanks

1995 ◽  
Vol 60 (8) ◽  
pp. 1274-1280 ◽  
Author(s):  
Kamil Wichterle
Keyword(s):  
Reynolds Number ◽  
Power Input ◽  
Dimensionless Number ◽  
Simple Correlation ◽  
Mixture Density ◽  
Surface Aeration ◽  
Free Level ◽  
High Reynolds ◽  
Level Effect ◽  
Turbine Impeller

Analysis of extended data on turbine impeller power input in geometrically similar agitated baffled tanks shows that the power number Po is a function of Reynolds number Po = Po*(Re) until the emergence of surface aeration. Though it is usually anticipated that Po* = const in high Reynolds number region, some, whatever weak, function should be taken into consideration in more detailed analysis of the power data even here. In practice, disturbances of level and gas captured in the impeller region play also a significant role, namely in smaller tanks at higher impeller speeds. Decrease of power input can be explained by decrease of gas-liquid mixture density, or in other words by increase of efficient gas holdup eE just in the impeller region. The value eE defined by the relation Po = Po*(Re)/(1 + eE) was determined from the available data. Like other effects of the surface aeration it depends mainly on the dimensionless number Nc = (We Fr)1/4. A simple correlation eE (Nc) is suggested as a correction factor for prediction of impeller power in presence of gas capture.

Surface Aeration Threshold in Agitated Vessels

1996 ◽  
Vol 61 (5) ◽  
pp. 681-690
Author(s):  
Kamil Wichterle ◽  
Tomáš Svěrák
Keyword(s):  
Simple Model ◽  
Liquid Surface ◽  
Power Input ◽  
Power Number ◽  
Region Analysis ◽  
Surface Aeration ◽  
Liquid Dispersion ◽  
Mixing Vessels ◽  
Number Curve

Violent agitation of liquids in mixing vessels may result in the regime of surface aeration being attained when the bubbles formed at the liquid surface enter the impeller region. Analysis of data on surface aeration for different liquids in a set of geometrically similar agitated vessels is presented. Data on the just aerated state as observed visually in transparent liquids, and data for the efficient aeration as determined from the break on the power number curve are considered. A simple model is developed for correlation of the data which enables the threshold of aeration to be predicted from the value of the recirculation number Nc = Nd (ρ/σg)1/4. The possibility of interpreting various literature data for the aeration threshold and for the power input with use of Nc is demonstrated. Similar modelling rules hold also for the correlation of beginning of the efficient liquid-liquid dispersion.

scholarly journals Under Ice Water Movements Induced by Mechanical surface Aeration and Air Injection

2001 ◽  
Vol 17 (4) ◽  
pp. 263-287 ◽  
Author(s):  
Theron G. Miller ◽  
W. C. Mackay ◽  
David T. Walty
Keyword(s):  
Air Injection ◽  
Surface Aeration ◽  
Ice Water ◽  
Mechanical Surface

Model-based optimization of equipment and control for heat flux measurements in a laboratory fermentor

1995 ◽  
Vol 11 (5) ◽  
pp. 525-532 ◽  
Author(s):  
Bastiaan H. A. van Kleeff ◽  
J. Gijs Kuenen ◽  
Ger Honderd ◽  
Sef J. Heijnen
Keyword(s):  
Heat Flux ◽  
Model Based ◽  
Flux Measurements ◽  
And Control ◽  
Laboratory Fermentor

scholarly journals Oscillation of water mass appearing in square and circular surface aeration tanks.

1982 ◽  
Vol 15 (5) ◽  
pp. 405-408
Author(s):  
HITOSHI TAKASE ◽  
HAJIME UNNO ◽  
TAKASHI AKEHATA
Keyword(s):  
Water Mass ◽  
Surface Aeration ◽  
Circular Surface

Effects of winter surface aeration on pelagic zooplankton communities in a small boreal foothills lake of Alberta, Canada

2014 ◽  
Vol 30 (3) ◽  
pp. 377-390
Author(s):  
Teslin G. Holmes ◽  
William M. Tonn ◽  
Cynthia A. Paszkowski ◽  
Garry J. Scrimgeour
Keyword(s):  
Surface Aeration ◽  
Zooplankton Communities

Evaluation of a Field-Scale Surface Aeration System in an Anaerobic Poultry Lagoon

2010 ◽  
Vol 26 (2) ◽  
pp. 307-318 ◽  
Author(s):  
S. Mukhtar ◽  
M. S. Borhan ◽  
S. Rahman ◽  
J. Zhu
Keyword(s):  
Field Scale ◽  
Surface Aeration ◽  
Aeration System ◽  
Scale Surface
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