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Dynamic and mass transfer characteristics of the flow issued from a bent chimney around buildings

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Abstract

The present work consists in an experimental investigation of the flow issuing from a bent chimney over a downstream obstacle. Our purpose is to explore the resulting flow field and its different characterizing features. These features were captured by means of the Particle Image Velocimetry technique. A numerical simulation of the problem has also been carried out and validated after comparison of the corresponding results to the experimental data. A good level of agreement was achieved between the experiments and the calculations. Then, we tried to upgrade our model by adopting large (real) scale dimensions. Our purpose consisted mainly in the observation and evaluation of the behavior of the incoming flow in presence of a double tandem obstacle. In a second step, we proposed to increase the number of the placed obstacles to four. The results given by the three-dimensional model are likely to highlight the dynamic features of the established field as well as the resulting mass transfer. Finally, we tried to evaluate the effect of further parameters on the characterizing features of the resulting flow filed such as the velocity ratio, the obstacles’ gap, the arrangement of the obstacles and the obstacles’ geometry.

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Abbreviations

d :

Chimney diameter (m)

h:

Chimney height (m)

H :

Building height (m)

H T :

Wind tunnel height (m)

W :

Distance separating the two buildings (m)

D ch-obs :

Distance separating the obstacle and the chimney (m)

F :

Mass fraction

G :

Gravitational acceleration (m/s2)

G k :

Term of production due to buoyancy forces [kg/(m s3)]

K :

Kinetic energy of turbulence (m2/s2)

P k :

Production term due to the mean gradients [kg/(m s3)]

R :

Velocity ratio

S ij :

Mean strain rate

T :

Temperature (K)

u ∞ :

Crossflow velocity (m/s)

v 0 :

Injection velocity (m/s)

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

Reynolds stress (m2/s2)

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)

n :

Normal of the considered surface

ρ :

Density (Kg/m3)

Β :

Thermal expansion coefficient (K−1)

Ε :

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

μ :

Fluid dynamic viscosity [kg/(m s)]

υ :

Kinematic viscosity (m2/s1)

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

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Authors and Affiliations

  1. TTPI, École Nationale d’Ingénieurs de Monastir, Université de Monastir, Monastir, Tunisie

    I. Bhouri Baouab & H. Mhiri

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

    N. Mahjoub Saïd

  3. IUSTI, UMR CNRS 7343, Technopôle de Château-Gombert, Aix-Marseille Université, Marseille, France

    Ph. Bournot & G. Le Palec

Authors
  1. I. Bhouri Baouab
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  2. N. Mahjoub Saïd
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  3. H. Mhiri
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  4. Ph. Bournot
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  5. G. Le Palec
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Correspondence to N. Mahjoub Saïd.

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Baouab, I.B., Mahjoub Saïd, N., Mhiri, H. et al. Dynamic and mass transfer characteristics of the flow issued from a bent chimney around buildings. Heat Mass Transfer 49, 337–358 (2013). https://doi.org/10.1007/s00231-012-1078-7

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  • DOI: https://doi.org/10.1007/s00231-012-1078-7

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