D325 管内流動抵抗に及ぼす界面活性剤添加の影響

概要

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This paper describes the pipe flow behavior of solutions of equimolar mixtures of tetradecyltrimethylammoniumbromide and sodiumsalicylate in tap water. The experiment was carried out using straight glass tubes with inside diameter D=5.02 mm and total length L=2712 mm and D=2.61 mm and L=1641 mm. The pressure loss was measured in wide Reynolds number range from the appearance of the effect of the shear induced state of the solution to the occurrence of laminar-turbulent transition. Typical flow characteristics in solutions were also investigated by means of flow visualization and LDV measurement. Surfactant additives ranging from 300 to 400 ppm with weight rather destabilized the flow and decreased the critical Reynolds number. The friction factor of 400 to 800 ppm solutions clearly increased at a Reynolds number of about 2000-3000 and then approached the Virk's asymptote of maximum drag reduction with increasing Reynolds number.
日本流体力学会の論文
2002-07-23