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Research Papers: Multiphase Flows

Turbulence Structure Modification and Drag Reduction by Microbubble Injections in a Boundary Layer Channel Flow

[+] Author and Article Information
C. C. Gutiérrez-Torres

SEPI-ESIME-Zacatenco, Departamento de Ingeniería Mecánica, Instituto Politécnico Nacional, U.P. Adolfo López Mateos Edif. 5 3er. Piso, LABINTHAP, Mexico, Distrito Federal 07738, Mexicocgutierrezt@ipn.mx

Y. A. Hassan

Department of Nuclear Engineering, Texas A&M University, 3133 TAMU, College Station, TX 77843-3133y-hassan@tamu.edu

J. A. Jimenez-Bernal

SEPI-ESIME-Zacatenco, Departamento de Ingeniería Mecánica, Instituto Politécnico Nacional, U.P. Adolfo López Mateos Edif. 5 3er. Piso, LABINTHAP, Mexico, Distrito Federal 07738, Mexicojjimenezb@ipn.mx

J. Fluids Eng 130(11), 111304 (Sep 23, 2008) (8 pages) doi:10.1115/1.2969444 History: Received September 02, 2007; Revised May 26, 2008; Published September 23, 2008

Turbulent boundary layer modification in a channel flow using injection of microbubbles as a means to achieve drag reduction was studied. The physical mechanism of this phenomenon is not yet fully understood. To obtain some information related to this phenomenon, single-phase (pure water) flow and two-phase (water and microbubbles) channel flow measurements are taken. The void fraction conditions were varied while maintaining a Reynolds number of 5128 based on the half channel height. The study indicates that the presence of microbubbles within the boundary layer modifies the turbulence structure such that variations in time and space turbulent scales are observed, as well as ejection and sweep phenomena.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Nondimensional streamwise velocity, U+, versus the nondimensional distance from the wall, y+, for single-phase flow

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Figure 3

Microbubble distribution along the normal direction

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Figure 4

Normal mean velocity profile

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Figure 5

Quadrant analysis events classification

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Figure 6

Instantaneous fluctuating velocity field for single-phase flow

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Figure 7

Instantaneous fluctuating velocity field for two-phase flow (α=4.9%, DR=38.4%)

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Figure 8

Two-dimensional two-point correlation coefficient at x+=69.7, y+=14.7 for streamwise fluctuating velocity for single-phase

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Figure 9

Two-dimensional two-point correlation coefficient at x+=69.7, y+=14.7 for streamwise fluctuating velocity for α=4.9%, DR=38.4%

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Figure 10

Two-dimensional two-point correlation coefficient at x+=69.7, y+=14.7 for normal fluctuating velocity for single-phase

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Figure 11

Two-dimensional two-point correlation coefficient at x+=69.7, y+=14.7 for normal fluctuating velocity for α=4.9%, DR=38.4%

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Figure 12

Instantaneous vortex field for a single-phase flow (method of Chong )

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Figure 13

Instantaneous vortex field for α=4.9%, DR=38.4% (method of Chong )

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Figure 14

Instantaneous vortex field for a single-phase flow (Jeong and Hussain method)

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Figure 15

Instantaneous vortex field for α=4.9%, DR=38.4% (Jeong and Hussain method)

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