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11:00
15 mins
Turbulence statistics of turbulent boundary layer flow following injection of drag-reducing surfactant solution
Shinji Tamano, Jun Ito, Hiroki Uchikawa, Yohei Morinishi
Session: Control 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 11:00
Room: Room D
Shinji Tamano (Nagoya Institute of Technology)
Jun Ito (Nagoya Institute of Technology )
Hiroki Uchikawa (Nagoya Institute of Technology )
Yohei Morinishi (Nagoya Institute of Technology)
Abstract:
To investigate streamwise variations of turbulence statistics in the wide range of the drag reduction ratio for the zero-pressure-gradient turbulent boundary layer flow due to the injection of drag-reducing nonionic surfactant solutions, we performed the laser-Doppler velocimetry (LDV) measurement at a new experimental apparatus with the larger size than previous one. The drag reduction ratio up to 76% could be obtained, at which the mean velocity in wall-units was beyond the Virk's ultimate for polymer solutions.