Flow and Heat Transfer Characteristics of a Channel with Cut-fins (2nd report: Experimental study on heat transfer performance)

摘要

In the present report, discussion is carried out for the fin pitch, notch arrangement and Reynolds number effects on the heat transfer and flow characteristics of a channel with cut-fin arrays mounted on the bottom wall. Reduction of the pressure loss was obtained by the cut-fin array case compared to the case of parallel fin without notches (plain-fin case). On the contrary, under the condition of Re = 200, a smaller thermal resistance was obtained by the plain-fin case. As Re increases in the range of 1000 ≤ Re ≤ 2000, heat transfer coefficient remains constant in the plain-fin case but increases in the cut-fin case. This results in a better performance for the cut-fin case in larger Re regime. When the notches are obliquely arranged, a larger heat transfer coefficient was obtained compared to the parallel arrangement case. This is believed to be attributed to the spanwise flow produced by the notch flowing along the inclined notch array.