Revealing the origins of vortex cavitation in a Venturi tube by high speed X-ray imaging

Hitoshi Soyama; Xiaoyu Liang; Wataru Yashiro; Kentaro Kajiwara; Eleni Myrto Asimakopoulou; Valerio Bellucci; Sarlota Birnsteinova; Gabriele Giovanetti; Chan Kim; Henry J Kirkwood; Jayanath C P Koliyadu; Romain Letrun; Yuhe Zhang; Jozef Uličný; Richard Bean; Adrian P Mancuso; Pablo Villanueva-Perez; Tokushi Sato; Patrik Vagovič; Daniel Eakins; Alexander M Korsunsky

doi:10.1016/j.ultsonch.2023.106715

Revealing the origins of vortex cavitation in a Venturi tube by high speed X-ray imaging

Ultrason Sonochem. 2023 Dec:101:106715. doi: 10.1016/j.ultsonch.2023.106715. Epub 2023 Dec 3.

Authors

Hitoshi Soyama¹, Xiaoyu Liang², Wataru Yashiro³, Kentaro Kajiwara⁴, Eleni Myrto Asimakopoulou⁵, Valerio Bellucci⁶, Sarlota Birnsteinova⁶, Gabriele Giovanetti⁶, Chan Kim⁶, Henry J Kirkwood⁶, Jayanath C P Koliyadu⁶, Romain Letrun⁶, Yuhe Zhang⁵, Jozef Uličný⁷, Richard Bean⁶, Adrian P Mancuso⁸, Pablo Villanueva-Perez⁵, Tokushi Sato⁶, Patrik Vagovič⁹, Daniel Eakins¹⁰, Alexander M Korsunsky¹⁰

Affiliations

¹ Department of Finemechanics, Tohoku University, 6-6-01 Aramaki, Aoba-ku, Sendai 980-8579, Japan. Electronic address: soyama@mm.mech.tohoku.ac.jp.
² Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
³ Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi 980-8577, Japan; International Center for Synchrotron Radiation Innovation Smart (SRIS), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi 980-8577, Japan; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
⁴ Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.
⁵ Synchrotron Radiation Research and NanoLund, Lund University, Box 118, Lund, 221 00, Sweden.
⁶ European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany.
⁷ Faculty of Science, Department of Biophysics, P. J. Šafárik University, Jesenná 5, 04154 Košice, Slovakia.
⁸ Diamond Light Source Ltd, Harwell Science and Innovation Campus, Diamond House, Didcot, OX11 0DE, UK; Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia.
⁹ European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany; Center for Free-Electron Laser (CFEL), DESY, Notkestraße 85, 22607 Hamburg, Germany.
¹⁰ Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK.

Abstract

Hydrodynamic cavitation is useful in many processing applications, for example, in chemical reactors, water treatment and biochemical engineering. An important type of hydrodynamic cavitation that occurs in a Venturi tube is vortex cavitation known to cause luminescence whose intensity is closely related to the size and number of cavitation events. However, the mechanistic origins of bubbles constituting vortex cavitation remains unclear, although it has been concluded that the pressure fields generated by the cavitation collapse strongly depends on the bubble geometry. The common view is that vortex cavitation consists of numerous small spherical bubbles. In the present paper, aspects of vortex cavitation arising in a Venturi tube were visualized using high-speed X-ray imaging at SPring-8 and European XFEL. It was discovered that vortex cavitation in a Venturi tube consisted of angulated rather than spherical bubbles. The tangential velocity of the surface of vortex cavitation was assessed considering the Rankine vortex model.

Keywords: Bubble; Hydrodynamic cavitation; Vortex; X-ray imaging.