Experimental Methods for the Study of Hydrodynamic Cavitation

Ceccio, Steven L.; Mäkiharju, Simo A.

doi:10.1007/978-3-319-49719-8_2

Cited by 3 publications

(2 citation statements)

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“…Several studies have described cavitation noise: for example, a tip vortex was reported as a “singing vortex” because of the cavitation noise or the cavitation noise from an orifice was described as pebbles being rolled through the device . A hydrophone type of instrument is commonly used for the acquisition of noise. , Hydrophones are especially useful for underwater acquisition given the requirement of acquisition in propellers and turbines . Different data processing techniques on the time and frequency spectra are used to analyze the cavitation noise: for example, the counting of number of peaks larger than certain threshold − and fast Fourier transform spectra ,− ,, are used to identify the inception condition.…”

Section: Introductionmentioning

confidence: 99%

“…24 A hydrophone type of instrument is commonly used for the acquisition of noise. 19,25 Hydrophones are especially useful for underwater acquisition given the requirement of acquisition in propellers and turbines. 20 Different data processing techniques on the time and frequency spectra are used to analyze the cavitation noise: for example, the counting of number of peaks larger than certain threshold 26−28 and fast Fourier transform spectra 7,20 −22,29,30 are used to identify the inception condition.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Analysis of Vortex-based Cavitation Devices: Inception and extent of cavitation

Ranade¹,

Sarvothaman

Ranade

2021

Ind. Eng. Chem. Res.

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Hydrodynamic cavitation (HC) is a process of generation, growth, and collapse of gas-/vapor-filled cavities leading to intense shear and localized hot spots. It is essential to identify the inception and extent of cavitation for ensuring appropriate operation of HC devices and processes. In this work, we demonstrate for the first time, usefulness of acoustic data acquired using an everyday mobile phone for characterizing inception and extent of cavitation. Acoustic data from vortex-based cavitation devices for a range of operating pressure drop (0−390 kPa) was obtained. Systematic methodology for identifying relevant acoustic features is presented. "Audio" and "DSP" Toolboxes of MATLAB were used for processing acoustic data. Three specific trends of extracted features with respect to the flow rate/ pressure drop across the HC device were observed. All three trends clearly identified inception of cavitation between 50 and 80 kPa pressure drop across the HC device. An attempt is made to connect features extracted from acoustic signals with the extent of cavitation in terms of perpass performance of HC device. The "flatness" was found to capture the influence of the HC device scale on performance (in other words, extent of cavitation) reasonably well. The methodology is quite general and will be applicable for any cavitation device. The presented results will be useful for online identification of inception and extent of hydrodynamic cavitation.

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