Non-contact method for analysis of cavitating flows

Biluš, Ignacijo (author), Bizjan, Benjamin (author), Lešnik, Luka (author), Širok, Brane (author), Pečnik, Boštjan (author), Dular, Matevž (author)

This paper presents a novel non-contact method for simultaneous analysis of pressure and velocity conditions in cavitating flows. The method (implemented in our software ADMflow) is based on high-speed camera flow visualization and was evaluated in an experiment with ultrasonically induced acoustic cavitation of different intensities. Attached cavitation with clearly visible cavitation structures occurred on the tip of an ultrasonic probe immersed in distilled water. Using the high-speed imaging data, pressure fluctuations were calculated by a computer-aided algorithm based on the Brennen’s theory of cavitation cloud kinematics and a modified version of the Rayleigh-Plesset equation. Reference measurements of pressure pulsations were conducted by a hydrophone installed at the bottom of the liquid container. The analysis of cavitation structure dynamics was complemented by calculation of velocity fields from the imaging data, the algorithm for which is based on the advectiondiffusion equation. Calculated pressure fluctuations were analyzed in the spatial, temporal and spectral domain. Presented results indicate a strong correlation between the fields of velocity and pressure fluctuations during the growth and collapse of cavitation structures. A comparison of time series and power spectra demonstrates that our cavitation analysis method is in a reasonably good agreement with results of the reference measurement methods and can therefore be used for non-contact analysis of pressure and velocity conditions in cavitating flows.

• Language: English
• Keywords: acoustic cavitation, sonotrode, pressure measurement, hydrophone, computer-aided visualization, image velocimetry
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Article acceptance date: 14.03.2017
• Year: 2017
• Number of pages: Str. 178-186
• Numbering: Vol. 81
• PID: 20.500.12556/RUL-126835
• UDC: 532.528
• ISSN on article: 0041-624X
• DOI: 10.1016/j.ultras.2017.03.011
• COBISS.SI-ID: 20392982
• Publication date in RUL: 06.05.2021

Record is a part of a journal

• Title: Ultrasonics
• Shortened title: Ultrasonics
• Publisher: Butterworth Scientific
• ISSN: 0041-624X
• COBISS.SI-ID: 26569728

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 01.11.2017

Secondary language

• Language: Slovenian
• Keywords: akustična kavitacija, merjenje tlaka, hidrofoni, računalniška podprta vizualizacija, velocimetrija slike