The monograph aims at monitoring of hydrodynamics and mass transfer in two-phase gas-droplet vortex flows in spraying countercurrent mass transfer apparatuses. Up-to-date methods of mass transfer in vortex gas-droplet flows and approaches for rational designing vortex apparatuses are presented. The de-velopment of innovative designs of mass transfer equipment is presented. Based on experimental studies and practical ex-perience, methods for evaluating the hydraulic and mass transfer characteristics have been proposed. Particular attention is paid to intensifying hydrodynamic and mass transfer pro-cesses in equipment for chemical technology. The scientific results have been achieved within the research project Creation of new granular materials for nuclear fuel and catalysts in the active hydrodynamic environment” (State reg. no. 0120U102036).