Construction of global reduced mechanisms by using the CSP method

The simulation of the combustion processes is rather complex when detailed mechanisms are used. The reduced mechanisms of reaction with a restricted number of reactions are thus of significant importance. These reduced mechanisms are composed of some steps, which imply a limited number of chemical species. In this paper, the method of CSP [1, 2] was applied to reduce a detailed mechanism GRI-3.0 [3]. To identify the species in a stationary state and the fastest elementary reactions, this technique requires as an input the detailed mechanism and the flame model. Based on an algorithm of CSP, several reduced mechanisms with various steps were given. The mechanism with 5-stages is regarded as a base of the other mechanisms with more reaction

The effect of straight chimney temperature on pollutant dispersion

Air pollution is considered one of the most important contemporary problems that threaten a person's life and environment. Among the major sources of air pollution are pollutants emitted from smokestacks. The objective of this work is to numerically study the dispersion of a pollutant ejected from a chimney into an air stream. The mass, momentum and energy conservation equations are solved using the finite volume method (MFV) and numerical simulations are performed using Ansys Fluent CFD software. Two case studies were discussed: The first case study is to study the influence of the direction of the wind speed and in the last case study, the temperature evolution on the dispersion of the ejected plume particles. The study demonstrated the extent of the dispersion in relation to these two parameters. The results obtained confirm the need to improve filtering systems in order to reduce the risks attributed to discharges and to propose solutions to manage the effect of these discharges on the environmental population

Modeling using experimental design method of the physicochemical parameters of the water quality in Meknes city, Morocco

This study was focused on the characterization of physicochemical parameters of drinking water, which are mainly involved during water treatment or analysis processes. we were interested in the application of the experimental design methodology, according to the method of Yates on the parameters that characterize the quality of drinking water in Meknes, Morocco. Six factors have been identified to control this quality. The influence of these parameters on the responses accommodated at the exit was highlighted. The derivation of a theoretical model has been realized and a series of experiments was performed. The analysis of our results, based on a statistical approach, was presented and the parameters that have a significant influence on the outputs have been identified. From these results, we can conclude that the input factors such as hardness, pH, conductivity, residual chlorine and turbidity have a large influence on measured output response (pHs). Moreover, the theoretical and experimental results are very convergent which validate our studied model