2022 Annual Meeting
(493f) Discovery of Maximum Drag Enhancement Asymptote in Turbulent Flow of Dilutepolymeric Solutions
Authors
Bamin Khomami - Presenter, University of Tennessee
Nansheng Liu, University of Science and Technology of China
Yabiao Zhu, University of Science and Technology of China
The existence of a maximum drag enhancement (MDE) asymptote at high rotation Ro, and
Weissenberg (Wi) numbers, in turbulent viscoelastic spanwise-rotating plane Couette flow has been
discovered. Specifically, above a critical Wi, drag enhancement plateaus and the MDE asymptote
is realized. The mean velocity profiles at MDE attain a unique log law profile that has an identical
slope but different intercepts as a function of Ro. MDE occurs in the elasto-inertial turbulence (EIT)
flow state; hence, it is mainly sustained by elastic forces much alike the maximum drag reduction
(MDR) asymptote, indicating that elastically induced drag modification asymptotes, i.e., MDR or
MDE are an inherent property of EIT.
Weissenberg (Wi) numbers, in turbulent viscoelastic spanwise-rotating plane Couette flow has been
discovered. Specifically, above a critical Wi, drag enhancement plateaus and the MDE asymptote
is realized. The mean velocity profiles at MDE attain a unique log law profile that has an identical
slope but different intercepts as a function of Ro. MDE occurs in the elasto-inertial turbulence (EIT)
flow state; hence, it is mainly sustained by elastic forces much alike the maximum drag reduction
(MDR) asymptote, indicating that elastically induced drag modification asymptotes, i.e., MDR or
MDE are an inherent property of EIT.