Experimental study of hydrodynamics in a vortex contact apparatusKhoshim Bakhronov, Abdumalik Akhmatov, Olim Sattarov, Nazara Khudoyberdiyeva and Sherzod AnnaqulovE3S Web Conf., 486 (2024) 05022DOI: https://doi.org/10.1051/e3sconf/202448605022