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Numerical and experimental study of a jet in a crossflow for different velocity ratio

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Abstract

This paper deals with a flow generated by the interaction between a circular jet and a crossflow for different velocity ratios (R = v 0/u ∞). This particular side of this study is of extremely high interest as it allows a better understanding of the mixing process of different interacting flows. This work presents experimental results obtained by means of the particle image velocimetry technique to track the evolution of the jet among the environment flow. Results showed the dependence of the emerging jet flow structure on its ratio velocity. A three-dimensional numerical model with a second-order turbulent model (RSM) and a non-uniform grid system is used to examine the behavior of the emerging jet in the crossflow. The comparison of the numerical and experimental results gives satisfactory agreement.

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Abbreviations

d :

Jet nozzle diameter, m

g :

Gravitational acceleration, m/s2

k :

Kinetic energy of turbulence, m2/s2

p :

Pressure, Pa

T :

Temperature, K

R :

Velocity ratio (v 0/u ∞)

u i , u j :

Velocity components along the i and j directions

u, v, w :

Velocity components along x, y, and z directions, m/s

x, y, z :

Cartesian coordinates, m

ρ :

Density, kg/m3

β :

Thermal expansion coefficient, K−1

ε :

Dissipation rate of the turbulent kinetic energy, m2 s−3

µ :

Kinetic viscosity, kg/(m s)

μ t :

Turbulent (or eddy) viscosity, kg/(m s)

δ ij :

Kronecker symbol (=1 if i = j and 0 if i ≠ j)

∞:

Conditions in crossflow

0 :

Exit section of the jet

¯ :

Reynolds average

˜ :

Favre average

‘ :

Fluctuation

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Authors and Affiliations

  1. LGM, Ecole Nationale d’Ingénieurs de Monastir, Université de Monastir, Monastir, Tunisia

    Rim Ben Kalifa

  2. LGM, Institut Préparatoire aux Etudes d’Ingénieurs de Monastir, Université de Monastir, Monastir, Tunisia

    Sabra Habli & Nejla Mahjoub Saïd

  3. Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13013, Marseille, France

    Hervé Bournot & Georges Le Palec

Authors
  1. Rim Ben Kalifa
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  2. Sabra Habli
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  3. Nejla Mahjoub Saïd
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  4. Hervé Bournot
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  5. Georges Le Palec
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Correspondence to Nejla Mahjoub Saïd.

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Technical Editor: Francisco Ricardo Cunha.

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Kalifa, R.B., Habli, S., Saïd, N.M. et al. Numerical and experimental study of a jet in a crossflow for different velocity ratio. J Braz. Soc. Mech. Sci. Eng. 36, 743–762 (2014). https://doi.org/10.1007/s40430-014-0129-z

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  • DOI: https://doi.org/10.1007/s40430-014-0129-z

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