Abstract
Flow of surfactant solution (C14 TABr and ARQUAD) through a sudden expansion pipe is studied experimentally from measurements of pressure distribution, velocity profile, and flow visualization. Two acrylic pipes with inside diameters of 15 mm and 30 mm are joined and the test section with 5.4 m length is used. Velocity profiles are measured by LDV. In the case of surfactant solution, loss coefficient of sudden expansion is lower than that for water at low Reynolds number. Pressure recovery length and reattachment length for surfactant solution increase remarkably compared with the case of water. In the sudden expanded pipe, fluid near the center of the pipe is very fast, while reverse flow appears near the wall. This flow becomes more remarkable for surfactant solution than for water.
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