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Flow and mixing characteristics of pulsed confined opposed jets in turbulent flow regime

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Abstract

A numerical study is performed on a two-dimensional confined opposed-jet configuration to gain basic understanding of the flow and mixing characteristics of pulsed turbulent opposed-jet streams. The sinusoidal pulsating flows with different temperature are imposed at opposed-jet inlets, which are mixed with each other in a confined flow channel. The current mathematical model taking the effect of temperature-dependent thermo-physical properties of fluid into account can present a good prediction for opposed-jet streams compared with experimental data. The numerical results indicate that introduction of temperature difference between opposed jet flows can lead to an asymmetric flow field immediately after jet impact, and the sinusoidal flow pulsations can effectively enhance mixing rate of opposed jets. Parameter studies are conducted for optimization of pulsed opposed jets. The effect of Reynolds number and flow pulsation as well as the configuration geometry on the mixing performance are discussed in detail. Examination of the flow and thermal field shows that the mixing rate is highly dependent on the vortex-induced mixing and residence time of jet fluid in the exit channel.

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Abbreviations

A :

Pulsation amplitude

c p :

Specific heat (J kg−1 K−1)

c k :

Thermal conductivity (W m−1 K−1)

f :

Frequency of pulsation (Hz)

g :

Gravity acceleration (m s−2)

H :

Nozzle-to-nozzle distance (m)

k :

Turbulence kinetic energy

L :

Exit channel length (m)

M :

Mixing rate

p :

Static pressure (Pa)

q :

Heat flux (W m−2)

Re :

Reynolds number, ρu jet w/μ

Re t :

Turbulent Reynolds number, k 2/εν

St :

Strouhal number, fw/u jet

t :

Time (s)

T :

Temperature (K)

∆T :

Temperature difference (K)

u :

Velocity (m/s)

w :

Nozzle width (m)

x, y :

Cartesian coordinates (m)

ρ :

Density (kg m−3)

μ :

Dynamic viscosity (kg m−1 s−1)

v :

Kinematic viscosity (m2 s−1)

ε :

Dissipation rate of turbulence kinetic energy

σ :

Standard deviation

δ :

Phase angle difference

′ :

Fluctuation

1:

Upper air stream

2:

Lower air stream

ave :

Average with time

i, j :

Indices in Einstein summation convention (Eqs. 1–3)

jet :

Jet flow

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Acknowledgments

This work was supported by National Natural Science Foundation of China through grant number 11202201, Zhejiang Provincial Natural Science Foundation of China through Grant no. Y6110343 and Qianjiang Program of Zhejiang Province through Grant no. 2011R10092.

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Authors and Affiliations

  1. College of Science, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education District, Hangzhou, 310018, China

    Shuxia Qiu, Peng Xu & Xianwu Qiao

  2. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Derive 1, Singapore, 117576, Singapore

    Arun S. Mujumdar

Authors
  1. Shuxia Qiu
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  2. Peng Xu
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  3. Xianwu Qiao
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  4. Arun S. Mujumdar
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Correspondence to Peng Xu.

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Qiu, S., Xu, P., Qiao, X. et al. Flow and mixing characteristics of pulsed confined opposed jets in turbulent flow regime. Heat Mass Transfer 49, 277–284 (2013). https://doi.org/10.1007/s00231-012-1092-9

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  • DOI: https://doi.org/10.1007/s00231-012-1092-9

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