Drag Reduction in a Turbulent Pipe Flow of Trymethylolethane Hydrate Suspensions - Effect of Pipe Diameter and Surfactant Additive on Pressure Drop

摘要

A phase change slurry contributes to save energy remarkably in district heating and cooling systems. Trymethylolethane (TME) hydrate was used as the latent heat transporting medium in TME water slurry. A drag-reducing additive (cationic surfactant and counter ion) was used to reduce the pressure drop, which was increased by solid particles suspended in water. Three kinds of test pipes, 13, 25, and 40 mm in diameter, were used in this study. The concentration of TME was set of 23.7 wt% and 27.5 wt%. The slurry temperature was adjusted at the arbitrary temperature between 6 and 25 °C. The additive can induce drag reduction in turbulent flow of TME slurry. A scale up law that applicable to the drag-reducing system was proposed. Its validity was confirmed by comparing the pressure drop data obtained in this study.