“…As in others approaches, the greatest number of researches were carried out for the spiral wound membrane modules, in particular in works [6, 23, 84, 88, 98, 101, 104, 106, 110, 112-114, 117, 121, 141, 149, 151, 155-157]. In this case, it should be noticed, that in work [149] it was declared that the influence of the channel curvature is significant and the neglect of this factor can lead to a significant mistake. At the same time, the channels of the spiral wound membrane modules were conditionally rolled out into the plane, in particular in works [6,[88][89]104].…”