The Effects of Impeller Types and Rotational Speeds on Bubble Size Distribution in an Salt- water System

Raman, Abdul Aziz Abdul (2005) The Effects of Impeller Types and Rotational Speeds on Bubble Size Distribution in an Salt- water System. Hanoi University of Technology.

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Abstract

<p><font face="Arial">The objective of this work was to study the effects of impeller types on bubble breakup characteristics in an aerated mixing vessel. Rushton turbine (RT) and Curve blade impellers (CB) of 6 blades were used in an air-salt water system to observe the bubble breakup characteristics. NaCI (salt) was added to the water as anti coalescence media. A fixed aeration rate of 5 Lzmin and varying impeller rotational speeds of 60, 80 and 100 rpm were used for all experiments. A sample of 100 bubbles were collected around the impeller region and analyzed for bubble size distribution (BSD) and bubble Sauter mean diameter (d32). In all cases, BSD curves obtained were almost like a Gaussian distribution, with slight deviations from the symmetry. Bubble sizes generated by Curve blade impellers were found to be smaller than that of the Rushton turbine at constant rotational speeds. And when rotational speeds increased, there was a decrease in bubble size for RT and increase in bubble size for CB.</font></p>

Item Type: Other
Uncontrolled Keywords: Bubble size distribution,Rushton Turbine,Curve Blade impeller,Mass transfer studies
Subjects: University Structure > Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: MR. ADNAN YAHYA
Date Deposited: 30 Apr 2008
Last Modified: 13 Jul 2015
URI: http://repository.um.edu.my/id/eprint/58330

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