Scroll heat sink: A heat sink with the moving fins inserted between the cooling fins

In this paper, a novel heat sink with moving fins inserted between cooling fins is suggested for electronics cooling applications. In the novel heat sink, instead of the fan module, moving fins are inserted in the intervals of fixed fins (cooling fins) for generating fluid flow. By the relative motion of the moving fins to the cooling fins, heat dissipation from the cooling fins to the coolant and discharge of the heated coolant occur simultaneously. In the present study, experimental investigation is performed in order to demonstrate the proposed concept of the heat sink. In the experimental study, the average fluid velocities and the thermal resistances are measured for various rotating speeds from 200 RPM to 500 RPM. Experimental results show that measured flow rates of the coolant are almost linearly proportional to the rotating speed of the moving fins. Finally, the thermal performance of the scroll heat sink is compared to that of an equivalent plate-fin heat sink under the same Reynolds number. The scroll heat sink has at least 14% lower thermal resistance than that of the equivalent plate-fin heat sink in the range 0.135 m/s < V <0.56 m/s.