Study of fluid layer gravity motion over vertical surface

This paper presents the results of studying motion a liquid layer along walls vertically installed pipe under action gravity. Two-dimensional boundary is formed by fluid relative to hard wall on surfaces structures (pipes, turbines, heat-and-mass transfer equipment, aircrafts, ships, etc.), which are positive interest in engineering practice. Further upgrading above-mentioned possible only increasing accuracy momentum layer, heat and mass rates calculation. It confirmed that phenomena intensity (perpendicular wall) due particles velocity distribution regularities cross-section layer. Fluid turn conditioned Reynolds number according current notions. The principal method quantitative analysis turbulent flow suggested continues be pressure fluctuations averaging for some timespan. model movement enables prognosticate conditions cross-sections reshaping profile takes place, carry out analytic calculation such hydrodynamic characteristics as mean motion, thickness shearing stresses acting wall. difference between methods developed parameters from well-known ones calculations made based an integrated approach regardless conceptual definitions laminar regimes widely used modern hydrodynamics. Obtained design formulas known literature have been compared. has found sliding determine proposed formula, 1.17 times smaller than determined currently formula