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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/26501

Title: The effects of ultrasound on micromixing
Authors: Jordens, Jeroen
Bamps, Bram
Gielen, Bjorn
Braeken, Leen
Van Gerven, Tom
Issue Date: 2016
Citation: ULTRASONICS SONOCHEMISTRY, 32, p. 68-78
Abstract: The Villermaux-Dushman reaction is a widely used technique to study micromixing efficiencies with and without sonication. This paper shows that ultrasound can interfere with this reaction by sonolysis of potassium iodide, which is excessively available in the Villermaux-Dushman solution, into triiodide ions. Some corrective actions, to minimize this interference, are proposed. Furthermore, the effect of ultrasonic frequency, power dissipation, probe tip surface area and stirring speed on micromixing were investigated. The power and frequency seem to have a significant impact on micromixing in contrast to the stirring speed and probe tip surface area. Best micromixing was observed with a 24 kHz probe and high power intensities. Experiments with different frequencies but a constant power intensity, emitter surface, stirring speed, cavitation bubble type and reactor design showed best micromixing for the highest frequency of 1135 kHz. Finally, these results were used to test the power law model of Rahimi et al. This model was not able to predict micromixing accurately and the addition of the frequency, as an additional parameter, was needed to improve the simulations. (C) 2016 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/1942/26501
DOI: 10.1016/j.ultsonch.2016.02.020
ISI #: 000377310900009
ISSN: 1350-4177
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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