In wiped-film evaporators, wipers with comb-wiping elements are often used. These elements are made of PTFE or electrocarbon and they bear on the concave evaporating area by the action of centrifugal force. This paper presents results of a study of the characteristics of such a wiper depending on the peripheral liquid load on the top of the evaporator, on the wiper peripheral speed and on the sense of wiper rotation. The shape of the residence-time distribution curves (RTD curves) and the residence-time values indicate the existence of three different hydrodynamic regimes for the film passage over the evaporating cylinder depending on operating conditions. Optimum distillation conditions are obtained in a regime with increased liquid retention resulting in a higher residence time. The augmented residence time is a positive factor which enables efficient evaporation to be carried out under gentle conditions at lower evaporator temperatures. It is possible to decrease or increase the passage of a liquid through the evaporator by a factor of two by changing the sense of the wiper＇s rotation. The obtained results show that there are interesting hydrodynamic conditions with intensive mixing on the evaporating cylinder at lower peripheral speeds. In addition, the longitudinal wave formation before the wiping element is minimized under these conditions.