Bibliographic info
Building Simulation, 2013, Chambéry, France
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 in-vestigate the air flow in this case: 2D and 3D DNS, and four sets of inlet-outlet velocity-pressure boundary conditions have been considered. Significant differ-ences 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 correla-tion covers a wide range of the Rayleigh number and aspect ratio values (RaH varying from 5.89 ⇥ 109 to 5.89 ⇥ 1010 and 6.5 < H/b < 12.8).
