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  • Theory‑assisted optical ray tracing to extract cavitation‑bubble shapes from experiment
    Koch, Max, inženir ...
    Experimental analysis of cavitation bubble dynamics typically uses optical imaging and photographic recording. However, the images are often severely afected by distortions and shadows due to ... refraction and total refection of the illuminating light at the liquid–gas interface of the bubble. Optical ray tracing may become a powerful tool for the analysis process by assisting in the comparison of experiments to numerical two-phase fow simulations. The novelty of the present approach consists in digitizing almost the complete experimental arrangement with all its optically relevant elements and objects—including a numerical model of the yet unknown bubble—and numerically photographing the scene via ray tracing. The method is applied to the jetting dynamics of single bubbles collapsing at a solid wall. Here, ray tracing can help in the interpretation of raw experimental data concerning the complex bubble interface deformations and internal structures during the collapse. The precise shape of the highly dynamical bubbles can be inferred, thus ray tracing provides a correction method for velocity values of the liquid jets. Strong evidence is found for the existence of an ultra-short-time, fast jet, exceeding velocities known to date in the feld.
    Vir: Experiments in fluids. - ISSN 0723-4864 (Vol. 62, Mar. 2021, str. 1-19)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2021
    Jezik - angleški
    COBISS.SI-ID - 177100291

    Povezava(-e):

    https://link.springer.com/article/10.1007/s00348-020-03075-6
    DOI

vir: Experiments in fluids. - ISSN 0723-4864 (Vol. 62, Mar. 2021, str. 1-19)
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