DRAG REDUCTION OF TRIMETHYLOLETHANE HYDRATE SLURRIES TREATED WITH SURFACTANTS
Drag reduction characteristics of trimethylolethane hydrate slurries treated with surfactants have been investigated. The effects of the surfactant concentration and hydrate fraction of the slurry on drag reduction behaviors were focused on in this paper. The friction coefficient in a pipe flow of hydrate slurries treated with surfactants and the relaxation time of trimethylolethane solution with surfactants were measured. From the results, it was found that the effective drag reduction appears in the cases of high surfactant concentration and of high hydrate fraction. This behavior was supported by the viscosity shear-thickening occurrence reported in the previous study. However, the effective drag reduction disappears in the case of low surfactant concentration in spite of the shear-thickening occurrence. On this discrepancy, the relaxation time of the solution was measured. It is found that the critical concentration determined from the relaxation time disappearance well corresponds to the limitation of effective drag reduction occurrence.
N.Wada H.Suzuki H.Usui S.Ujiie
Graduate School of Science and Technology, Kobe University,657-8501, Kobe, Japan Department of Chemical Science and Engineering, Kobe University,657-8501, Kobe, Japan The Kansai Electronic Power co, 661-0974, Amagasaki, Japan
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）