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Abstract
A numerical analysis was carried out to study the performance of mixed convection in a horizontal duct with two heated blocks mounted on the bottom plate and baffles arranged on the up plate. The effects of the dimensionless height of baffle H b , the dimensionless distance between the block and baffle D , and the number of baffle N on the flow structure and heat transfer characteristics were investigated for the system at various Reynolds number Re and ratio of Grashof number to square of Reynolds number Gr/Re 2 . With the two baffles installed at D 1 =0 and D 2 =0, results show that the maximum augmentation in the average Nusselt number of the second heated block exceeds 320% for H b1 = H b2 =0.4, Pr = 0.7, 100 h Re h 1,000, and 0 h Gr/Re 2 h 10, while the maximum augmentation is about 130% for the first heated block. When a single baffle is located between the two heated blocks, the heat transfer performance of both the first and second heated blocks can be significantly promoted. However, only the heat transfer performance of the second heated block can be enhanced, as the baffle is installed behind the second heated block.
