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Research Papers: Flows in Complex Systems

Relaminarization of Axisymmetric Turbulent Flow With Combined Axial Jet and Side Injection in a Pipe

[+] Author and Article Information
Snehamoy Majumder1

Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, Indiasrg_maj@yahoo.com

Dipankar Sanyal

Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India

1

Corresponding author.

J. Fluids Eng 132(10), 101101 (Oct 06, 2010) (6 pages) doi:10.1115/1.4002505 History: Received November 22, 2007; Revised August 25, 2010; Published October 06, 2010; Online October 06, 2010

The effect of side mass injection on turbulent flow with axial entry to a circular duct in the form of centrally confined jet has been investigated. A standard κ-ε model modified for streamline curvature has been used for detailed analysis following a comparison with a κ-ω model for some test cases. Results show that flow stabilization and relaminarization could occur due to the side injection. The predicted recirculation zone, friction factor, total turbulent energy, turbulent shear stress, Taylor scale Reynolds number, and turbulent energy flux show gradual reduction with increase in the side injection velocity.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 5

Relaminarization by side injection for jet flow confined in the vicinity of duct axis

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Figure 6

Variations with injection velocity for (a) recirculation width and (b) recirculation length

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Figure 7

Variations with momentum flux ratio for (a) recirculation width and (b) recirculation length

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Figure 8

Turbulent energy distribution

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Figure 9

Turbulent shear stress distribution

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Figure 10

Effect of side injection velocity on variations of (a) friction factor and (b) total turbulent energy

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Figure 11

Reduction in Taylor scale Reynolds number Reλ due to side injection

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Figure 4

Effect of side injection at a location of recirculation zone without side injection

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Figure 3

Comparison of the results of side injection with different turbulent models for centrally confined jet structure

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Figure 2

Validation of turbulent flow modeling for (a) combined axial and side entry with one-seventh power-law profile at axial entry and (b) jet velocity ratio versus separation position

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Figure 1

Schematic of the axisymmetric flow and the geometry

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