Inscrição na biblioteca: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

RADIATION-TURBULENCE INTERACTION IN CHANNEL FLOWS OF INFRARED ACTIVE GASES

Get access (open in a dialog) DOI: 10.1615/IHTC9.4040
pages 403-408

Resumo

We study theoretically turbulent flows of absorbing and emitting gases inside a channel. Radiative properties of gases such as H2O and CO2 are computed from a random statistical narrow-band model and a near-wall turbulence model is used to solve flow equations in a coupled manner with the energy and radiative equations. We study first the influence of radiation on mean flow properties (mean temperature and mean velocity fields, wall heat fluxes) and then, the interaction between radiation and thermal turbulence spectra is briefly discussed in the idealized case of homogeneous and isotropic turbulence. It is found that radiation affects the conductive transfer coefficient only when the radiative flux is greater than the conductive one. On the other hand, radiative dissipation of temperature fluctuations modifies significantly thermal turbulence spectra, especially at high temperatures and for low values of the mechanical turbulence dissipation rate.