Heat sink
A heat sink includes a first array of fins defining a plurality of first channels therebetween, a second array of fins disposed at opposite sides of the first array of fins, and a plurality of grooves extending through the first array of fins and the second array of fins. The second array of fins defines a plurality of second channels therebetween. The grooves are intersected with the first channels and the second channels. A bottom extremity of each groove has a curved shape facing upwardly and laterally. A portion of an airflow generated by a fan mounted on a top of the heat sink flows laterally and downwardly through the grooves to leave the heat sink.
1. A heat sink assembly comprising:
a heat sink defining a plurality of airflow channels extending through front and rear ends of the heat sink and a plurality of airflow grooves intersected with the airflow channels; and
a fan mounted on a top side of the heat sink and blowing an airflow into the channels and the grooves of the heat sink;
wherein a cross section of the heat sink has a substantially trapeziform configuration at which the grooves are defined, a part of the airflow flows through the channels to leave the heat sink via the front and rear ends thereof, and another part of the airflow flows through the grooves to leave the heat sink via lateral sides thereof;
wherein the heat sink comprises a substrate and two wings extending outwardly and upwardly from a top of the substrate;
wherein a plurality of first fins are disposed between the wings, and a plurality of second fins are disposed between the substrate and the wings, and wherein a part of the airflow channels is defined between the first fins and another part of the airflow channels is defined between the second fins; and
wherein the grooves each are defined by cutting away upper portions of the first fins except midmost ones thereof, the wings and the second fins, the grooves each having a gradually increased depth from a middle of the heat sink towards a lateral side of the heat sink.
2. The heat sink assembly as claimed in claim 1 , wherein each of the grooves has a bottom extremity with a arc-shaped configuration.
3. The heat sink assembly as claimed in claim 1 , wherein the grooves are defined at opposite lateral portions of the heat sink.
4. The heat sink assembly as claimed in claim 2 , wherein the arc-shaped configuration is a concave facing a upper, lateral side of the heat sink.