Analysis of Impact Load Induced by Ultrasonic Cavitation Bubble Collapse Using Thin Film Pressure Sensors

Authors: Moiz S. Vohra, Nagalingam Arun Prasanth, Wei L. Tan, S. H. Yeo

Abstract:

The understanding of generation and collapse of acoustic cavitation bubbles are prerequisites for application of cavitation erosion. Microbubbles generated due to rapid fluctuation of pressure induced by propagation of ultrasonic wave lead to formation of high velocity microjets and or shock waves upon collapse. Due to vast application of ultrasonic, it is important to characterize and understand cavitation collapse pressure under the radiating surface at different conditions. A comparative investigation is carried out to determine impact load and dynamic pressure distribution exerted upon bubble collapse using thin film pressure sensors. Measurements were recorded at different input conditions such as amplitude, stand-off distance, insertion depth of the horn inside the liquid and pulse on-off time of acoustic vibrations. Impact force of 2.97 N is recorded at amplitude of 108 μm and stand-off distance of 1 mm from the sensor film, whereas impulsive force as low as 0.4 N is recorded at amplitude of 12 μm and stand-off distance of 5 mm from the sensor film. The results drawn from the investigation indicated that variety of impact loads can be achieved by controlling generation and collapse of bubbles, making it suitable to use for numerous application.

Keywords: Ultrasonic cavitation, bubble collapse, pressure mapping sensor, impact load.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1314473

References:

[1] Samir C.R, Jean-Perre Franc, Marc Fivel, ‘Cavitation erosion: Using target material as a pressure sensor’, J. of Applied Physics 118, 164905 (2015).
[2] Peter R.B, Douglas G.O, Christopher J.J, ‘Multiple observations of cavitation cluster dynamics close to an ultrasonic horn tip’, J. Acoust. Soc. Am. 130 (Nov 2011) Pg. 3379-3388.
[3] X. Ma, B. Huang, G. Wang, M. Zhang, ‘Experimental investigation of conical bubble structure and acoustic flow structure in ultrasonic field’, Ultrasonics Sonochemistry 34 (2017) 164-172.
[4] Leen V.W, ‘Mechanics of collapsing cavitation bubbles’, Ultrasonics Sonochemistry 29 (2016) 524-527.
[5] L. Bai, W. Xu, J. Deng, C. Li, D. Xu, Y. Gao, ‘Generation and control of acoustic cavitation structure’, Ultrasonics Sonochemistry 21 (2014) 1696-1706.
[6] Christian Vanhille, ‘A two-dimensional nonlinear model for the generation of stable cavitation bubbles’, Ultrasonics Sonochemistry 31 (2016) 631-636.
[7] C. Vanhill, C. Campos-Pozuelo, C. Granger, B. Dubus, ‘A numerical study of the formation of a conical cavitation bubble structure at low ultrasonic frequency’, Physics Procedia 70 (2015) 1070-1073.
[8] B. K. Sreedhar, S.K. Albert, A.B. Pandit, ‘Cavitation damage: Theory and measurement – Review’, Wear 372-373 (2017) 177-196.
[9] T. Okada, Y. Iwai, S. Hattori, N. Tanimura, Relation between impact load and damage produced by cavitation bubble collapse’, Wear 184 (1995) 231-239.
[10] T. Momma, A. Lichtarowicz, ‘A study of pressure erosion produced by collapsing cavitation’, Wear 186-187 (1995) 425-436.
[11] S. Singh, J. Choi, G. Chahine, ‘Characterization of cavitation fields from measured pressure signals of cavitating jets and ultrasonic horns’, J. Fluids Eng., Trans. ASME, vol. 135 (Sept 2013) 091302-1 to 091302-11.
[12] J. Choi, G. Chahine, ‘Relationship between material pitting and cavitation field impulsive pressures’, Wear 352-353 (2016) 42-53.
[13] K. S. Jansson, M.P. Michalski, S. D. Smith, R.F. LaPrade, C.A. Wijdicks, ‘Tekscan pressure sensor output changes in the presence of liquid exposure’, J. of Biomechanics 46 (2013) 612-614.