Volume No. 2 Issue No.: 2 Page No.: 226-234 October-December 200

 

WIND TUNNEL SIMULATION STUDY OF VEHICULAR EXHAUST DISPERSION

 

M.K. Krishna*1 and R.M. Mahalingegowda2

1. Department of Environmental Engineering, P. E. S. College of Engineering, Mandya, Karnataka (India)

 

Received on : August 5, 2007

 

ABSTRACT

 

Simulation experiments were carried out in the Environmental Wind Tunnel to understand the vertical spread of pollutants (sz) in simulated Atmospheric boundary layers .The vertical profiles of line source dispersion followed power law profile, the concentration of the tracer showed decreasing trend with increase in height above the tunnel floor and downwind distance. Twenty one hydrocarbon tracer experiments were performed to evaluate(sz) in simulated Atmospheric boundary layers corresponding to three different terrain roughness and approaching wind direction of 90o.It showed an increasing trend with the downwind distance. The observed values were compared with that of Rao and Keenan (1) field values. it is concluded that they were in same trend, but the observed values were higher than that of Rao and Keenan1. This is due to fact that field experiments were done in low roughness conditions.

 

Keywords : Atmospheric boundary layer, Vertical dispersion, Simulation, Vehicular emissions, Environmental wind tunnel.

 

 

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