Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Numerical investigation of heat transfer by natural convection and radiation in a cavity with participating media
Submission Author:
CRISTIAN URIEL MENDOZA CASTELLANOS , SP
Co-Authors:
Jan Armengol, Carlos Salinas, Rafael Beicker Barbosa, Rogério Gonçalves dos Santos
Presenter: CRISTIAN URIEL MENDOZA CASTELLANOS
doi://10.26678/ABCM.ENCIT2016.CIT2016-0626
Abstract
This paper deals with the numerical solution of combined heat transfer by radiation and natural convection in a square cavity under normal room conditions, filled with an absorbing-emitting and isotropic scattering medium. The finite volume method (FVM) has been adopted to solve the governing equations of natural convection and the discrete ordinates method (DOM) is used to solve the radiative transfer equation (RTE), using a Tn6 angular quadrature. Natural convection and radiative transfer equations are solved simultaneously. The numerical model is validated by comparison with results taken from literature. In this work, Nusselt number, temperature and velocity field are numerically studied for scattering albedo between 0.0-1.0 for different Rayleigh number and optical thickness comparing the cases for pure natural convection and natural convection with radiative heat transfer effects. The results show that the effects of radiation are greater when the Rayleigh number is increase. Similarly, is shown that the influence of scattering albedo is stronger for cavities with a higher Rayleigh number and optical thickness.
Keywords
Numerical simulation, Natural Convection, Radiative heat transfer, Radiation heat transfer, Finite Volumes, discrete ordinates method
