Author(s)

M. Gustiuc1, T. Denes1, S. El Hamdani1, K. Limam1 & I. Colda2

Abstract

This paper focuses on the solid contaminant dispersion in a ventilated room under different ventilation conditions. Experiments in a full-scale laboratory chamber are conducted in order to validate the numerical results. The ventilation efficiency for different positions of the inlet and outlet, as well as the influence of the ventilation rate, was established. A two-layer k-ε high Reynolds number is used for the continuous phase, with the same boundaries and initial conditions the experimental setup. The 113 000 particles in the range of 0.35-10 µm are tracked during the 600 s simulation time. The importance of the gravity forces for such small particles is established. Keywords: CFD modelling, airflow rate, building, particle, Eulerian, Lagrangian, ventilation, experimental, numerical. 1 Introduction The indoor air quality became a major concern in the last years. People spend most of their time in closed spaces, therefore is vital to predict the pollutant concentration as accurate as possible. Researches were conducted under various conditions, but the complexity and the variety of the phenomena involved in the pollutant dispersion in indoor spaces makes difficult to achieve reliable results. Many of the earlier studies considered well-mixed conditions for the contaminant, as Nazaroff et al. [1], Nomura et al. [2], Lai et al. [3], Abadie et al. [4]. This approach means that the concentration decay rate in one point fully describe the entire room. Adequacy of the well mixed hypothesis depends on a variety of factors, such as integration time and environmental determinants. Room’s ventilation, temperature

Keywords

CFD modelling, airflow rate, building, particle, Eulerian, Lagrangian, ventilation, experimental, numerical.