The monograph is devoted to modern methods of calculation and the designing of devices of vortical type providing realisation of effective processes of division and mass transfer. In the book the designs of vortical devices are considered, the available experimental material on research of de-dusters is systematised. Interaction of structure of current of a liquid and gas with design parameter of the device is revealed, the generalised characteristics of hydrodynamics of streams are offered. The extensive experimental material on regimes of movement of a liquid film in the device as empirical dependencies is generalised. Methods of calculation of efficiency mass transfer in devices of the vortical type, taking into account aerohydrodynamical laws of stream of gas and a liquid are offered. Results of the work can be used development and designing of vortical devices for processes for dust separation.