An experimental and numerical study has been conducted to examine the heat transfer and flow friction characteristics in a channel of aspect ratio of 10 fitted with the in-phase and out-phase 45° Z-baffles in the turbulent regime from Re=4400 to 20,400. For the in-phase Z-baffles, the Nu, f and TEF values are dependent of the baffle height, pitch and Reynolds number. It is interesting to note that the Nu tends to increase with increasing the Re and the baffle height but with decreasing the baffle pitch. The in-phase Z- baffle performs better than the out-phase one.
Also, the presence of the Z-baffle leads to a substantial increase in friction loss compared with the smooth channel with no baffle. The TEF of the in-phase Z-baffles tends to decrease with the increase in Re, baffle height and pitch values. The in-phase Z-baffle with e/H=0.1, P/H=1.5
provides the highest TEF at about 2.2 at the lowest Re.