Micromixing Effects In Air Pollution Modelling
Author(s)
A. Garmory, E. Richardson & E. Mastorakos
Abstract
Predicting the dispersion of reacting pollutants close to their source is a topic
of importance in Air Quality Modelling. The conventional method of neglecting
species concentration fluctuations is not valid for such small-scale problems. Var-ious
methods that incorporate segregation are reviewed here and their use for typ-ical
atmospheric dispersion problems is illustrated through numerical simulations
of a simplified problem. By comparison with experimental data, it is found that
micromixing can affect the evolution of the mean reaction rate and that the models
presented here are more accurate than if segregation were not included. Further
work should focus on the interfacing of these models with practical Air Quality
calculations.
Keywords: segregation, turbulent reacting flows, air quality.
1 Introduction
A current goal of urban air quality studies is to predict as accurately as possible the
pollution that humans actually experience. Grid models for cities must hence have
enough resolution to track the pollution produced in street canyons or dispersed
in the immediate vicinity of industrial sources. This necessitates novel approaches
concerning the chemical reaction and its interaction with the atmospheric turbu-lence
because the reactant segregation,ormicromixing, cannot be neglected at
such fine scales. The purpose of this paper is to demonstrate that this is indeed the
case for typical small-scale dispersion problems, to review some of the previous
work on this topic and to suggest methods by which segregation can be taken into
account. Some new results from our own efforts in implementing advanced turbu-lent
reacting flow theories in atmospheric dispersion problems are also presented.
Keywords
segregation, turbulent reacting flows, air quality.
Related Book
Other papers in this volume
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