Free Level Effect on the Impeller Power Input in Baffled Tanks

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Title:Free Level Effect on the Impeller Power Input in Baffled Tanks
Creators:
Wichterle, Kamil
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 60, 8, pp. 1274-1280

Abstract

<p>Analysis of extended data on turbine impeller power input in geometrically similar agitated baffled tanks shows that the power number <i>Po </i>is a function of Reynolds number <i>Po </i>= <i>Po</i>*(<i>Re</i>) until the emergence of surface aeration. Though it is usually anticipated that <i>Po</i>* = 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 <i>Po </i>= <i>Po</i>*(<i>Re</i>)/(1 + eE) was determined from the available data. Like other effects of the surface aeration it depends mainly on the dimensionless number <i>Nc </i>= (<i>We Fr</i>)<sup>1/4</sup>. A simple correlation eE (<i>Nc</i>) is suggested as a correction factor for prediction of impeller power in presence of gas capture.

Title:Free Level Effect on the Impeller Power Input in Baffled Tanks
Creators:
Wichterle, Kamil
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:60
Number:8
Page Range:pp. 1274-1280
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19951274UNSPECIFIED
ID Code:824
Item Type:Article
Deposited On:06 Feb 2009 17:04
Last Modified:06 Feb 2009 16:04

Citation

Wichterle, Kamil (1995) Free Level Effect on the Impeller Power Input in Baffled Tanks. Collection of Czechoslovak Chemical Communications, 60 (8). pp. 1274-1280. ISSN 0010-0765

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