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Research Papers: Fundamental Issues and Canonical Flows

Experimental Study of Turbulence Transport in a Dilute Surfactant Solution Flow Investigated by PIV

[+] Author and Article Information
Weiguo Gu

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, Chinaguweiguo@sjtu.edu.cn

Yasuo Kawaguchi

Member of JSME, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japanyasuo@rs.noda.tus.ac.jp

Dezhong Wang

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, Chinadzwang@sjtu.edu.cn

Saito Akihiro

 Mitsubishi Heavy Industry, Kobe, Hyogo 654-0153, Japan

J. Fluids Eng 132(5), 051204 (May 13, 2010) (7 pages) doi:10.1115/1.4001631 History: Received February 20, 2009; Revised April 09, 2010; Published May 13, 2010; Online May 13, 2010

Drag-reducing flow of dilute surfactant solution in the two-dimensional channel is investigated experimentally by using particle image velocimetry (PIV) system. Five hundred instantaneous velocity frames of u-v in the x-y plane are taken by PIV for every condition. Fluctuation intensity and instantaneous velocity distributions are discussed in order to study the turbulence transport in the drag-reducing flow. As compared with water, the results show that wall-normal velocity fluctuations in the drag-reducing flow are suppressed significantly, and instantaneous velocity distributions display different features. Moreover, the drag-reducing flow exhibits the reduced inclination angle of turbulence transport and appearance of “zero Reynolds shear stress.” High shear dissipation also appears in some solutions. Based on the analysis of the balance of mean and mean turbulent kinetic energies, it is found that the complex rheology, i.e., the elasticity and viscosity of the solution, is considered as the main factor that change the characteristics of turbulence transport.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of the experimental facility

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Figure 2

Optical configuration for the PIV measurement

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Figure 3

Frictional factor versus Reynolds number

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Figure 4

Drag reduction versus Reynolds number

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Figure 5

Profiles of U+ at Re=15,000

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Figure 6

Profiles of U+ at Re=40,000

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Figure 7

Profiles of RMS of velocity fluctuations at Re=40,000: (a) RMS of u+′ and (b) RMS of v+′

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Figure 8

Profiles of RMS of velocity fluctuations at Re=15,000: (a) RMS of u+′ and (b) RMS of v+′

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Figure 9

Profiles of RMS of velocity fluctuations at Re=10,000: (a) RMS of u+′ and (b) RMS of v+′

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Figure 10

Profiles of RMS-u+′ of the 40 ppm CTAC solution

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Figure 11

Profiles of RMS-u+′ of the 60 ppm CTAC solution

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Figure 12

Instantaneous distribution of streamwise velocity fluctuations in the x-y plane: (a) water at Re=10,000; (b) 25 ppm at Re=10,000; (c) 40 ppm at Re=10,000; (d) 60 ppm at Re=10,000; (e) 100 ppm at Re=10,000; (f) 100 ppm at Re=15,000; (g) 60 ppm at Re=15,000; and (h) 100 ppm at Re=40,000

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Figure 13

Profiles of the Reynolds shear stress at Re=10,000

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Figure 14

Profiles of dU/dy at Re=10,000

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