2022/02/21 by Shota Yamamoto, Takaaki Shimazaki, Yamamoto, Shota +9 · 2 citations
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics Simulations and Interactions #Underwater Acoustics Research #Underwater Vehicles and Communication Systems #physics.app-ph #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.2202.10082
5 pages, 5 figures, submitted to Experiments in Fluids Comments: Corrected the affiliation of Jingzu Yee
openalex publication_date 2022/02/21 · arxiv created 2022/04/04 · arxiv updated 2022/04/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A high-resolution background-oriented schlieren (BOS) technique, which utilizes a high-resolution camera and a microdot background pattern, is proposed and used to measure the pressure field of an underwater shock wave in a microtube. The propagation of the shock wave subsequently reaches a concave water-air interface set in the microtube resulting in the ejection of a focused microjet. This high spatial-resolution BOS technique can measure the pressure field of a shock front with a width as narrow as the order of only 101 μm with a peak pressure as large as almost 3 MPa, which is significantly narrower and larger, respectively, than a previous study [1]. This significant breakthrough has enabled the simultaneous measurement of the pressure impulse of the shock front and the velocity of the microjet tip. As a result, we have experimentally observed the linear relation between the velocity of the microjet tip and the pressure impulse of the shock front for the cases without secondary cavitation in the liquid bulk. Such relation was theorectically/numerically predicted by Peters [2]. This study demonstrated the capability of the proposed high-resolution BOS technique as a microscale contactless pressure measurement tool for underwater shock waves and potentially other micro- and nano-fluids.