Visualization research on the influence of an ultrasonic degassing system on the operation of a hydraulic gear pumpPiotr Antoniak, Jarosław Stryczek, Michał Banaś, Oleksandr Lyhovskyi, Ihor Gryshko, Andrii Zilinskyi and Vasyl KovalovMATEC Web Conf., 211 (2018) 03005DOI: https://doi.org/10.1051/matecconf/201821103005