Experimental study of hydrodynamics in a vortex contact apparatus Khoshim Bakhronov, Abdumalik Akhmatov, Olim Sattarov, Nazara Khudoyberdiyeva and Sherzod Annaqulov E3S Web Conf., 486 (2024) 05022 Published online: 07 February 2024 DOI: 10.1051/e3sconf/202448605022