mai 16 2015
Influence of the dynamic boundary conditions on natural convection in an asymmetrically heated channel
http://dx.doi.org/10.1016/j.
Bastide
août 21 2013
Numerical investigation of natural convection in an asymmetrically heated inclined channel-chimney systems
Abstract :
The present paper is concerned with the results of the numerical investigation of unsteady laminar, natural convection in an asymmetrically heated inclined open channel (i = 0, 45, 60 and 75◦ ) with walls at uniform heat flux (qw = 10, 50, 75 and 100W · m−2 ). Two methodological approaches have been adopted to investigate the air flow in this case: 2D and 3D DNS, and four sets of nlet-outlet velocity-pressure boundary conditions have been considered. Significant differences are observed in the flow dynamics between 2D and 3D results. The numerical results are compared with the experimental data and a good agreement is obtained when a local pressure boundary condition is applied at the inlet/outlet sections in the 3D case. A generalized correlation for the average Nusselt number is then obtained from numerical results. This correlation covers a wide range of the Rayleigh number and aspect ratio values.
