Abstract
The present paper is concerned with the results of the numerical investigation of unpermanent 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 100 W m−2). Two methodological approaches have been adopted to investigate the air flow in these configurations: 2D and 3D description, and four sets of inlet-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 modified Rayleigh number and aspect ratio values (Ramcos(i) varying from 1.71 × 104 to 3.60 × 106 and 6.5 < H/b < 12.8).
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