A study of the three-dimensional flow of a liquid film (rivulet) over the external part of an inclinedcylinder was conducted for liquids with various physical properties. Patterns of the flow regimes were con-structed. Good agreement is observed between the experimental data on the thickness and wall friction with thecalculation with an asymptotic model in the case of a waveless rivulet. A comparison of the evolution of naturalwaves on rivulets with the theory of waves of maximal growth shows good agreement for small Re numbers.During the experiments, the wave characteristics of excited waves on a rivulet were investigated. The thickness,amplitude, frequency, and phase velocity of the waves over a wide range of variable parameters are given. Phasevelocity integrated functions of the amplitude are constructed for various liquids. The friction on the cylinderwall is measured in the presence of natural and excited waves. The effects of wave regimes on the average val-ues and RMS (root-mean-square) friction pulsations are studied.
展开▼
