Gas radiation effects on opposing double-diffusive convection in a non-gray air–H2O mixture

Comparative Study of Radiative Effects on Double Diffusive Convection in Nongray Air-CO2Mixtures in Cooperating and Opposing Flow

“…Therefore, the objective of our investigation is to highlight the effect of nongray gas radiation on natural double diffusive convection (flow structures, heat and mass transfer, and so on) in the three convective flow regimes: thermal, intermediate, and mass dominated, when buoyancy forces are cooperating or opposing. We also note that this work is an extension and a further exploration of our previous studies, where we have considered an opposing flow in air-H 2 O mixture only [26] or a cooperating flow in gas mixtures (air-CO 2 or air-H 2 O) at two average concentrations of pollutant only (10% and 25%) [25].…”

“…Recently, some attempts have been made to study double diffusive convection coupled to radiation in participating gases, accounting for the real (nongray) radiative properties of the mixture (absorption varies with temperature, concentration, and wavelength). In this context, we can mention the numerical studies performed by Meftah et al [25] and Laouar-Meftah et al [26] in a stationary laminar flow of air-CO 2 (or air-H 2 O) gas mixtures and Ibrahim and Lemonnier [27] in transient laminar flow of N 2 -CO 2 mixture. The authors used the SLW spectral model of Denison and Webb [28] along with the discrete ordinate method to account for the real radiative participation of the medium.…”

Numerical investigation of coupled natural convection and radiation in a differentially heated cubic cavity filled with humid air. Effects of the cavity size

“…This issue was first stated by Borget et al [12], who considered molecular gas radiation to predict the onset of instability and transition to turbulence in a differentially heated cavity. The most recent studies devoted to the interaction between gas radiation and natural convection, whether in square [13,14] or cubic cavities [9,15,16], resort to global models to precisely account for the spectral properties of molecular gases.…”

Effect of horizontal walls emissivity on coupled double diffusive convection and non gray-gas radiation of air-H<inf>2</inf>O mixture in a cooperating case

“…They showed that radiation plays an important role in such systems: in aiding cases, it stabilizes the fluid flow and accelerates the transition to steady state while, in opposing cases, it favors the occurrence of thermosolutal instability resulting in a longer and oscillatory transition to a steady state solution. Very recently, Laouar-Meftah, Cherifi, Lemonnier, and Benbrik [10] numerically analysed the influence of gas radiation on laminar double-diffusive convection in a non-gray air-H 2 O mixture, when the thermal and mass buoyancy forces are opposite. They showed that radiation effects depend on the nature of flow regime.…”