TY - GEN
T1 - Instantaneous turbulent structure relating to momentum and scalar transport in a reducing channel flow with surfactant additives
AU - Matsumoto, Takuya
AU - Hara, Shumpei
AU - Tsukahara, Takahiro
AU - Kawaguchi, Yasuo
N1 - Funding Information:
This work was partially supported by the Grant-in-Aid for Scientific Research (C) #25420131 from the Japan Society for the Promotion of Science.
Publisher Copyright:
© 2017 ASME.
PY - 2017
Y1 - 2017
N2 - Turbulent surfactant solution flows dramatically suppress turbulent scalar and momentum transports with changes to turbulent structures near the wall. In this study, particle image velocimetry and planar laser induced fluorescence concentration measurement method were used simultaneously to analyze turbulent mass transfer experimentally in surfactant channel flows at high Reynolds number. When compared against the instantaneous flow fields of the water case, the results showed a decrease in the magnitude of elementary vortices in the near-wall region. Momentum and scalar transports are caused by the combination of elementary vortices that are irregularly arranged at the outer edge of the shear layer. A conceptual vortex model is proposed for turbulent scalar transfer that provides a partial explanation for the turbulence statistics of a surfactant solution flow, such as the Reynolds shear stress, turbulent mass flux, and mean concentration distribution.
AB - Turbulent surfactant solution flows dramatically suppress turbulent scalar and momentum transports with changes to turbulent structures near the wall. In this study, particle image velocimetry and planar laser induced fluorescence concentration measurement method were used simultaneously to analyze turbulent mass transfer experimentally in surfactant channel flows at high Reynolds number. When compared against the instantaneous flow fields of the water case, the results showed a decrease in the magnitude of elementary vortices in the near-wall region. Momentum and scalar transports are caused by the combination of elementary vortices that are irregularly arranged at the outer edge of the shear layer. A conceptual vortex model is proposed for turbulent scalar transfer that provides a partial explanation for the turbulence statistics of a surfactant solution flow, such as the Reynolds shear stress, turbulent mass flux, and mean concentration distribution.
UR - http://www.scopus.com/inward/record.url?scp=85033783631&partnerID=8YFLogxK
U2 - 10.1115/FEDSM2017-69533
DO - 10.1115/FEDSM2017-69533
M3 - Conference contribution
AN - SCOPUS:85033783631
T3 - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
BT - Symposia
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2017 Fluids Engineering Division Summer Meeting, FEDSM 2017
Y2 - 30 July 2017 through 3 August 2017
ER -