The paper presents the results of numerical studies of the effect of the wall-boundary layer of oil deposits formed on the inner surface of oil trunk pipelines. The possibility to reduce the hydraulic drag and to increase the throughput capacity of pipelines due to the thermal insulating and surface-smoothing properties of the asphalt-resin-wax oil deposits layer is mathematically proved. Numerical experiments proved the efficiency of the wall-boundary layer of deposits with various thickness both in isothermal and ‘hot’ oil pipelines. The effect is due to lower roughness of the inner surface of the pipes and higher flow temperature. The latter in non-isothermal sections of hot pumping leads to the lower average viscosity of the pumped oil. In case of isothermal pumping, the deposit layer is efficient only in developed turbulent flow conditions. Moreover, in large diameter pipelines, the effect of the deposit layer is maintained even at its considerable thickness, despite a high reduction in the inner pipeline diameter.
How to Cite
asphalt-resin-wax deposits, oil pipeline, thermal insulation, surface roughness, hydraulic drag, thermalhydraulic conditions, viscosity, optimal thickness of the wall-boundary layer
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