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Research Papers: Flows in Complex Systems

Numerical and Experimental Study on Jet Trajectories and Mixing Behavior of Venturi-Jet Mixer

[+] Author and Article Information
S. Sundararaj

Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore, Tamilnadu 641008, Indiapapers.sundar@yahoo.co.in

V. Selladurai

Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, Tamilnadu 641014, Indiaprofvsdcit@yahoo.com

J. Fluids Eng 132(10), 101104 (Oct 21, 2010) (9 pages) doi:10.1115/1.4002575 History: Received March 08, 2010; Revised September 14, 2010; Published October 21, 2010; Online October 21, 2010

An investigation of the jet trajectories and mixing behavior of venturi-jet mixers, in which turbulent jet injects fluid at an arbitrary angle to mix incompressible fluids, is described in this paper. Numerical results of an incompressible cross flow-jet mixing in venturi-jet mixers are presented and validated against experimental results. Jet trajectories, concentration decay of tracer jet, spatial unmixedness, and mixing length are computed for a range of injection angles (45degθo135deg). Twenty-five cases are studied with five different initial injection angles, each with five different jet momentum ratios. As an example of practical insights that can be gained from such detailed analysis, the resulting flow field is used to obtain an equation for trajectory and tracer concentration in the mixer. The penetration of jet scales with the third root of the jet-to-mainstream momentum ratio and that of with square root of downstream distance. The decay of mean concentration scales with the inverse of axial distance and with the negative root of injection angle. The results show a consistency in the experimental data and simulation has provided a good insight into the flow details and has paved the way in optimization of the geometry based on jet injection angle to get a good mixing efficiency.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

A simple venturi-jet mixer

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Figure 2

Coordinate system and relevant variables in a venturi-jet mixer

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Figure 3

Schematic of a venturi-jet mixer with an initial jet angle of 45 deg

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Figure 4

Normalized jet trajectories with d for different injection angles: (a) 45 deg, (b) 60 deg, (c) 90 deg, (d) 120 deg, and (e) 135 deg

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Figure 5

Jet windward trajectories for different injection angles: (a) 45 deg, (b) 90 deg, and (c) 120 deg (— Numerical simulation, — this work correlation, - - - Yuan and Street R=2, Re=2100, and —- Yuan and Street R=3.3, Re=2100)

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Figure 6

Jet width growth for a 60 deg injection angle: (a) pipeline mixer and (b) venturi-jet mixer

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Figure 7

Concentration decay(experimental) for injection angles: (a) 45 deg, (b) 60 deg, (c) 90 deg, (d) 120 deg, and (e) 135 deg

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Figure 8

A values for 45 deg<θo<135 deg and 265<Sho<460

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Figure 9

Comparison of concentration decay trend line, injection angles: (a) 45 deg, (b) 90 deg, and (c) 135 deg (—: experimental values, - - - - -: numerical values, and o: correlation results)

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Figure 10

Spatial unmixedness in downstream direction for various injection angles and Reynolds number: (b)–(d) notation same as (a), (f) [Re=31917] notation same as (e) [Re=57451]

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Figure 11

Normalized downstream flame length (—: Broadwell and Breidenthal; ×: 45 deg; o: 60 deg; ◻: 90 deg; △: 120 deg; ◇: 135 deg)

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