Print Email Facebook Twitter Turbulence radiation interaction in channel flow with various optical depths Title Turbulence radiation interaction in channel flow with various optical depths Author Silvestri, S. (TU Delft Energy Technology) Patel, A. (TU Delft Energy Technology) Roekaerts, D.J.E.M. (TU Delft Fluid Mechanics; Eindhoven University of Technology) Pecnik, Rene (TU Delft Energy Technology) Date 2018 Abstract The present work consists of an investigation of the turbulence radiation interaction (TRI) in a radiative turbulent channel flow of grey gas bounded by isothermal hot and cold walls. The optical thickness of the channel is varied from 0.1 to 10 to observe different regimes of TRI. A high-resolution finite volume method for radiative heat transfer is employed and coupled with the direct numerical simulation (DNS) of the flow. The resulting effects of TRI on temperature statistics are strongly dependent on the considered optical depth. In particular, the contrasting role of emission and absorption is highlighted. For a low optical thickness the effect of radiative fluctuations on temperature statistics is low and causes the reduction of temperature variance through the dissipating action of emission. On the other hand, while increasing optical thickness to relatively high levels, the dissipation of temperature variance is balanced, at low wavenumbers in the turbulence spectrum, through the preferential action of absorption, which increases the large-scale temperature fluctuations. A significant rise in the effect of radiation on the temperature variance can be observed as a consequence of the reduction of radiative heat transfer length scales. Subject channel flowshear layer turbulenceturbulent convection To reference this document use: http://resolver.tudelft.nl/uuid:7ae86adc-d5f2-4d65-8989-3cd0becb655d DOI https://doi.org/10.1017/jfm.2017.738 ISSN 0022-1120 Source Journal of Fluid Mechanics, 834, 359-384 Part of collection Institutional Repository Document type journal article Rights © 2018 S. Silvestri, A. Patel, D.J.E.M. Roekaerts, Rene Pecnik Files PDF turbulence_radiation_inte ... depths.pdf 999.79 KB Close viewer /islandora/object/uuid:7ae86adc-d5f2-4d65-8989-3cd0becb655d/datastream/OBJ/view