Aiming to enhance the cooling performance of block heat sources on a
short board in a two-dimensional channel, this study proposes the methods
of constructing slots in the board and installing a baffle onto the channel wall. The influences of the slot length, baffle height, baffle position, board location and Reynolds number on the flow structure, temperature distribution and heat transfer coefficient are numerically investigated.Results show that the construction of slots in the board (slotted board) can significantly improve the heat transfer characteristics of block heat sources.When a baffle is introduced into the system with slotted board, the thermal characteristics are further enhanced. The maximum enhancements of the average Nusselt numbers are about 192% and 66% for the front and rear surfaces of blocks,
respectively, when Pr = 0.7, Le = 0.5, La = Lf = 1, Hb =Lb = 0.3, Db = 0.7, Ds = 0.4, Df = 0.1, Lp = 0.1, 0.2 ≦ C2 ≦ 0.4, 0 ≦ Ls ≦ 0.2, 0 ≦ Hp ≦ 0.15, 0 ≦ Dp ≦ 1.5 and 100 ≦ Re ≦ 500.Meanwhile the maximum reduction in the hot spot temperatures is about 42%.