What is it about?
Cloud cavitation is a well-known phenomenon in the engineering field where countless bubbles undergo collective growth and collapse rapidly. In particular, a shock wave is induced by the cloud collapse, whose destructive power leads to serious damage to turbines and other hydromachinery. On the other hand, the shock wave from the cloud has been harnessed in medical and environmental technology, such as the laser-induced liquid jet knife and water purification. Therefore, it is crucial to understand how the shock wave is emitted in association with the unsteady motion of the cloud. In this study, we used two high-speed cameras to simultaneously capture the unsteady motion of the cloud and the shock wave to offer new insights into the mechanism of this phenomenon.
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Photo by Zoran Borojevic on Unsplash
Why is it important?
Our study clarified how the shock wave is generated during the cloud collapse and revealed key characteristics, such as shock wave propagation speed and decay. This knowledge is essential for constructing a mathematical model to analyze and simulate this phenomenon. Such models could help us to predict damage to machines and contribute to technologies in medical and environmental applications.
Perspectives
This experiment has been performed with the support of many students from Yoshimura Laboratory, as well as Sparkling Photon Inc., KATOKOKEN Co., Ltd., and Nobby Tech. Ltd. I would like to express my gratitude to all of them and hope that this research will contribute to the advancement of knowledge.
Assistant Professor Takahiro Ushioku
Tokyo Noko Daigaku
Read the Original
This page is a summary of: Unsteady behavior of cloud cavitation and its induced shock waves: Part 1: Experimental observations and analysis, Experimental and Computational Multiphase Flow, December 2024, Tsinghua University Press,
DOI: 10.1007/s42757-024-0236-8.
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