Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL MODELING OF EFLUENT DISPERSION IN RIVERS WITH DIFFERENT LONGITUDINAL DIFFUSION COEFFICIENTS
Submission Author:
Almir Guilherme Siqueira Lopes Ritta , RJ , Brazil
Co-Authors:
Roger Matsumoto Moreira
Presenter: Almir Guilherme Siqueira Lopes Ritta
doi://10.26678/ABCM.ENCIT2016.CIT2016-0552
Abstract
The study of pollutant dispersion is very important to assess the environmental impact of new industrial developments in rivers and to develop a mitigation plan in case of any toxic product spill. The purpose of this paper is to study numerically the effects of longitudinal diffusion models in the dispersion of efluents in rivers and channels. Continuity and Navier-Stokes equations are solved via a finite volume method with a homogeneous multiphase condition for a 2D channel. The velocity field is then used to solve the mass transport of a soluble efluent in the time domain considering different longitudinal diffusion coefficients. Results are shown in terms of the concentration field along time and space, showing significant differences of peak concentration and time of arrival of the plume depending on the diffusion model employed.
Keywords
River dynamics, longitudinal dispersion coefficient, Computational Fluid Dynamics
