A novel multiple micro-jet impinging cylindrical fin heat sink was constructed. The heat sink was designed as a sandwich structure with a compact structure

where the upper part was an air chamber and the middle part was a jet orifice plate. In addition

a return channel was arranged on the jet orifice plate

which reduced the influence of the transverse flow on the jet impingement heat transfer. At the bottom was a gas chamber

which was equipped with a cylindrical fin plate. Cylindrical fins can increase the heat transfer area and enhance the fluid disturbance to enforce heat transfer. The effects of Reynolds number

heat flux

and height-diameter ratio on the heat transfer characteristics of the heat sink were studied using experimental and numerical methods. The results show that a cooled surface with a cylindrical fin has a lower temperature

and the average convective heat transfer coefficient of the cooled surface increases by 1%–3% compared with that of a surface without a fin at jet Re of 1596–2 874; the jet impact heights H were 4 mm

6 mm

and 8 mm. As the Re increases

the heat transfer performance gradually improves. When the Re of the jet was 2 874

the maximum average convective heat transfer coefficient of the cooled surface of the cylindrical fin plate reached 1 360 W/(m2?K).