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Numerical simulation of pollutants dispersion emitted by a bent chimney

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Abstract

We propose to numerically study the dispersion of pollutants emitted from a chimney bent around an obstacle. A numerical simulation of the dispersion of pollutants emitted from a chimney has been performed using the CFD code Fluent. The influence of the ratio (R) of the jet speed to the lateral wind velocity, the distance between the chimney and the obstacle and the height of the obstacle on the dispersion of the ejected pollutants was studied. The numerical method used to solve the flow equations is a finite volume method, the mesh size adopted is non-uniform, very close to the chimney and around the obstacle. The results show essentially that the dispersion of the pollutants is more pronounced for larger R-ratios. It is also shown that the location and height of the obstacle modify the flow, the further the chimney is from the obstacle the greater the dispersion of pollutants. Also, ejection at a higher chimney height generates a larger plume which favours dilution and dispersion.

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Abbreviations

\(u_{i} , u_{j}\) :

Velocity components along the i and j directions (m s−1)

\(\overline{u}_{i} , \overline{u}_{j}\) :

Mean velocity along i and j directions (m s−1)

\(u_{i}^{^{\prime}} , u_{j}^{^{\prime}}\) :

Fluctuating velocity components in i and j directions (m s−1)

\(x_{i} , x_{j}\) :

Coordinate along i and j directions (m)

x, y:

Cartesian coordinates (m)

T:

Temperature (K)

\({\overline{\text{T}}}\) :

Mean temperature (K)

ρ:

Density (kg m−3)

\(\overline{p}\) :

Mean pressure (Pa)

ν:

Kinematic viscosity (m2 s−1)

\(S_{i} , S_{k} , S_{\varepsilon }\) :

Source term

µ:

Dynamic viscosity (kg m1 s−1)

\({\text{P}}_{{\text{r}}}\) :

Prandtl number

\(\mu_{t}\) :

Turbulent viscosity (kg m1 s−1)

\(\sigma_{t}\) :

Turbulent Prandtl number

k:

Kinetic energy of turbulence (m2 s−2)

\(\sigma_{k} , \sigma_{\varepsilon }\) :

Constant of the model of turbulence

ε:

Dissipation rate of the turbulent kinetic energy (m2 s−3)

\(C_{1\varepsilon } , C_{2\varepsilon } , C_{\mu }\) :

Constants of the model

G:

Production term of k (kg m−1 s−3)

R:

Velocity ratio uchimney/uwind

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Authors and Affiliations

  1. Laboratory of Atomic, Mechanical, Photonic and Energetic, Physics Departement, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco

    Fida Zair & El Houssine Chatri

  2. Department of Energy, ENSAM Meknes, Moulay Ismail University, Meknes, Morocco

    Mhamed Mouqallid

Authors
  1. Fida Zair
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  2. Mhamed Mouqallid
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  3. El Houssine Chatri
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Correspondence to Fida Zair.

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Zair, F., Mouqallid, M. & Chatri, E.H. Numerical simulation of pollutants dispersion emitted by a bent chimney. Environ Fluid Mech 22, 113–132 (2022). https://doi.org/10.1007/s10652-022-09833-w

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