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RESEARCH PAPERS: Non-Newtonian Behavior and Rheology

Confined Swirling Flows of Aqueous Surfactant Solutions Due to a Rotating Disk in a Cylindrical Casing

[+] Author and Article Information
Shinji Tamano

Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japantamano.shinji@nitech.ac.jp

Motoyuki Itoh, Kazuhiko Yokota

Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan

Mitsunori Yoshida

 Toyota Industries Corporation, 2-1 Toyoda-cho, Kariya, Aichi 448-8671, Japan

J. Fluids Eng 130(8), 081502 (Jul 23, 2008) (9 pages) doi:10.1115/1.2956593 History: Received February 27, 2007; Revised August 23, 2007; Published July 23, 2008

In this study, confined swirling flows of an aqueous surfactant solution due to a rotating disk in a cylindrical casing were investigated using a sectional flow visualization technique and a two-component laser Doppler velocimetry system. The concentrations of aqueous surfactant solutions (C14TASal) are 0.4wt%, 0.8wt%, and 1.2wt%. Rheological properties such as shear viscosity and first normal stress difference of the surfactant solution were measured with a rheometer. The patterns of secondary flow were classified using the Reynolds and elasticity numbers. We revealed that the projection formed near the center of the rotating disk moved up and down at a constant frequency for C14TASal0.8wt% and 1.2wt%, which has not been reported as far as we know. The effects of the Reynolds number, elasticity number, and aspect ratio on the velocity profiles were clarified. It was also found that the region of rigid body rotation existed at the higher Reynolds number tested for C14TASal0.4wt%.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Axial distribution of azimuthal velocity component for Newtonian fluid at Re=140 and H∕R=2

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Figure 3

Rheological properties for steady shear flow of surfactant solutions at T=22°C: (a) shear viscosity and (b) first normal stress difference

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Figure 4

Typical secondary flow patterns for C14TASal0.8wt% at H∕R=2: (a) type Rs at Re0=1.51, (b) type PO at Re0=22.7, and (c) type Np at Re0=49.2

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Figure 11

Axial distribution of the azimuthal velocity component for C14TASal0.4wt% at Re0=87.0

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Figure 12

Radial distribution of the azimuthal velocity component for C14TASal0.4wt% at H∕R=2: (a) Re0=87.0, (b) Re0=261, and (c) Re0=609

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Figure 13

Radial distribution of the azimuthal velocity component for C14TASal0.4wt% at z∕H=0.3

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Figure 15

Power spectra for C14TASal0.8wt% at z∕H=0.9, Re0=22.7, and H∕R=2: (a) axial velocity component and (b) azimuthal velocity component

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Figure 16

Period of oscillation versus Reynolds number for C14TASal0.8wt% and 1.2wt% at H∕R=2

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Figure 17

Contours on the r-z plane for C14TASal0.8wt% at Re0=22.7 and H∕R=2: (a) Vzrms∕(RΩ) and (b) integral value of the energy spectrum of filtered Vz. The filter band is between 0.05Hz and 0.13Hz.

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Figure 14

Time variations of Vθ and Vz for C14TASal0.8wt% at r∕R=0.3, z∕H=0.9, Re0=22.7, and H∕R=2

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Figure 5

Secondary flow pattern for C14TASal0.4wt% at H∕R=2 and Re0=609 (type VB)

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Figure 6

Dependence of secondary flow patterns on E0 and Re0: (a) H∕R=1 and (b) H∕R=2

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Figure 7

Velocity vectors on the r-z plane for C14TASal0.4wt%: (a) Re0=87.0 and (b) Re0=261

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Figure 8

Radial distribution of velocity for C14TASal0.4wt% at z∕H=0.9 and H∕R=2: (a) azimuthal velocity component and (b) axial velocity component

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Figure 9

Radial distribution of the azimuthal velocity component at H∕R=2: (a) C14TASal0.4wt% and (b) C14TASal1.2wt%

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Figure 10

Radial distribution of the axial velocity component at H∕R=2: (a) C14TASal0.4wt% and (b) C14TASal1.2wt%

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Figure 1

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