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RESEARCH PAPERS: SPECIAL ISSUE ON BOILING AND INTERFACIAL PHENOMENA: Forced Convection

Drag and Heat Transfer Reduction Phenomena of Drag-Reducing Surfactant Solutions in Straight and Helical Pipes

[+] Author and Article Information
Wael I. Aly, Naoto Haruki, Akihiko Horibe

Graduate School of Natural Science and Technology,  Okayama University, Okayama 700-8530, Japan

Hideo Inaba

Graduate School of Natural Science and Technology,  Okayama University, Okayama 700-8530, Japaninaba@mech.okayama-u.ac.jp

J. Heat Transfer 128(8), 800-810 (Jan 23, 2006) (11 pages) doi:10.1115/1.2217751 History: Received May 17, 2005; Revised January 23, 2006

Flow drag and heat transfer reduction phenomena of non-ionic aqueous surfactant solutions flowing in helical and straight pipes have been experimentally investigated at surfactant solution concentration range of 2505000ppm and temperature range of 520°C. The helically coiled pipes have curvature ratios range of 0.018–0.045. Experimental findings indicate that the friction factors and the heat transfer coefficients of the surfactant solution in helical pipes are significantly higher than in a straight pipe and lower than Newtonian fluid flow like water through the same coils in the turbulent drag reduction region. Drag reduction and heat transfer reduction increase with an increase in surfactant solution concentration and temperature in the measured concentration and temperature ranges. On the other hand, they decrease with increasing of the curvature ratio. A set of empirical expressions for predicting the friction factor and the average Nusselt number for the surfactant solution’s flow through helical and straight pipes have been regressed based on the obtained data in the present experiments.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 16

DR and HTR as a function of Re′

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Figure 17

Effect of surfactant concentration on DR and HTR in the straight pipe

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Figure 18

Comparisons of experimental values of the friction factor and Nusselt number with those predicted with the proposed correlations 18–21

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Figure 6

Friction behavior of aqueous ODEAO solution in the helical and straight pipes

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Figure 10

Dimensionless wall temperature distribution along the coiled pipes: (a) Coil 2 water at 20°C (b) Coil 1 ODEAO solution 2530ppm and 20°C

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Figure 11

Variation of Nusselt number Nux with axial distance along the coiled pipes at almost same concentration and at 20°C: (a) Coil 1, (b) coil 2, (c) coil 3

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Figure 12

Nusselt number Nu behavior of aqueous ODEAO solution in the helical and straight pipes

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Figure 13

Temperature effect on average Nusselt number Nu behavior of aqueous ODEAO solution in coil 3 and the straight pipe

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Figure 14

Concentration effect on average Nusselt number Nu behavior of aqueous ODEAO solution: (a) Straight pipe, (b) coil 1

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Figure 15

Effect of temperature on DR and HTR in coil 1, coil 3, and the straight pipe

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Figure 7

Temperature effect on friction behavior of aqueous ODEAO solution in coil 3 and the straight pipe

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Figure 8

Wall shear stress τw as a function of the mean flow velocity Um

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Figure 1

Schematic diagram of the experimental apparatus

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Figure 2

Geometry of the helical pipe test section

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Figure 3

Chemical structure of surfactant

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Figure 9

Concentration effect on friction factor: (a) Straight pipe (b) coil 1 (T=10°C)

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Figure 4

Relationship between τ and γ̇

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Figure 5

Relationship between K and n with temperature, at different concentrations

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