Abstract
The problem of two-dimensional natural convection flow of a dielectric fluid in a square inclined enclosure with a fin placed on the hot wall is investigated numerically. The fin thickness and length are 1/10 and 1/2 of the enclosure side, respectively. The Rayleigh number is varied from 103 to 5 × 105 and the solid to fluid thermal conductivity ratio is fixed at 103. The enclosure tilt or inclination angle is varied from 0° to 90°. The streamlines and isotherms within the enclosure are produced and the heat transfer is calculated. It is found that for 2.5 × 104 ≤ Ra ≤ 2.5 × 105, the average Nusselt number is maximum when γ = 0° and minimum when γ = 90°. For Ra = 5 × 105, the values of enclosure tilt angle for which the average Nusselt number is maximum or minimum are completely different due to the transition to unsteady state. In this case, the maximum heat transfer is obtained for γ = 60°, while the minimum heat transfer is predicted for γ = 0°. Monomial correlations relating the average Nusselt number with the different values of the Rayleigh number from 104 to 105 are determined for two different angles, γ = 0° and γ = 90°.
Notes
St. (Steady); Uns. (Unsteady).