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ABSTRACT
Aiming to enhance the performance of laminar forced convection in a two-dimensional channel containing a short board mounted with block heat sources, this study proposes a method of constructing slots in the board. The effects of the slot position, board location, and Reynolds number on the flow structure, temperature distribution, and heat transfer coefficient are investigated numerically. Results show that when the stream approaches and passes the short board, the streamlines and isotherms may deflect strongly in the regions near the leading and trailing edges of the board. Comparing the results for the situations without and with slots in the board, the maximum enhancements of the average Nusselt numbers are about 81%, 57%, and 55% for the front, top, and rear surfaces of blocks, respectively, when Pr = 0.7, 50 ≤ Re ≤ 500, L e = 0.5, L a = L f = 1, H b = L b = 0.3, D b = 0.7, D f = 0.1, 0 ≤ L s ≤ 0.2, 0.1 ≤ D a ≤ 0.4, and 0.2 ≤ C 2 ≤ 0.5. In addition, the convective transfer behaviors are more sensitive to the variation of slot position when the spacing between the board and bottom channel plate C 2 is smaller.
Financial support for this study by the Engineering Division of the National Science Council, Republic of China, through contract NSC-93-2212-E-150-003, is greatly appreciated.
Notes
A, without slot; B, with slots, L s = 0.2 and D a = 0.4.
A, without slot; B, with slots, L s = 0.2 and D a = 0.4.