The micro-W-shaped ribs roughened plate in a multiple-jet impingement cooling system was studied by combining the integrated surface with impingement cooling technology. Steady-state experiments and transient thermal liquid crystal testing technology were used to explore the heat transfer characteristics of multiple-jet impingement onto a flat plate and a roughened plate with micro-W-shaped ribs. The impingement spacing ratios were 1.5

3 and 5. The Reynolds number based on hydraulic diameter ranged from 15000 to 40000. It was concluded from the results that the averaged Nusselt number and pressure loss increased with the Reynolds number

and decreased with the impingement spacing ratio. Compared with the impingement onto the flat plate

the micro-W-shaped ribs roughened plate can increase the averaged Nusselt number by 5.1%-7.3%

when the impingement spacing ratio was 1.5. However

the increase in pressure loss was negligible. When impingement spacing ratio was larger than 3

the enhancement of heat transfer caused by micro-W-shaped ribs was not distinct.