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Characterisation of Mixing Rate Due to High Power Ultrasound by Talal F. Yusaf; David R. Buttsworth is a Engineering article available to read on EtoBox.

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For meaningful assessment of results from laboratory and pilot plant trials, it is often necessary to know the mixing characteristics within the ultrasonic reactors. Previous workers have used conductivity measurements in an attempt to characterize the residence time distribution in ultrasonic reactors, but these results do not provide direct data on the mixing within the high power region adjacent to the ultrasonic probe tip. We overcome this difficulty through direct visualization of the mixing process within the high energy region close to the tip of the ultrasonic probe. Our analysis proceeds by determining an approximate turbulent diffusivity in a batch reactor arrangement for different values of ultrasonic energy input. For input electrical power levels between 70 and 120 W and a processing volume of 30 ml, the effective turbulent diffusivity varied from about 0.2 x 10(-3) to 0.7 x 10(-3)m(2)/s. We demonstrate that such results can be coupled to a suitable dispersion model to estimate the actual residence time distribution in flow-though arrangements when the through-put adds little additional mixing energy. Therefore, coupling the effective turbulent diffusivity identified i

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Author

Talal F. Yusaf; David R. Buttsworth

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1350-4177)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)