Heat Sink Fin Orientation

An advantage of bonded fin designs is that the heat sink base and the fins can be of different metals.

Heat sink fin orientation.

The heat sink should be oriented as in fig 1 or fig 2 under natural convection cooling. Light emitting diode led light source is known as the 4th generation illumination technology because. It is assumed that the device to be cooled is properly mounted and the heat sink is in its normally used mounting orientation with respect to the direction of air flow. Experimental setup and analysis method.

It is recommended that the heat sink be installed to orient the fins in a direction that will not block air movement under natural convection. Unique fin requirements thermal engineers sometimes need heat sinks with either very tall fins or very thin fins that are tightly spaced. Respectively bonded fin heat sinks and skived fin heat sinks suit these requirements nicely. In which case the orientation of the fins will probably make less of a difference.

Typically the fins are oriented in a way to permit a natural convection air draft to flow upward through rectangular u channels or ducts formed by the fins. A trapezoidal fins heat sink with various orientations tested under a controlled environment. However the sideward vertical fin orientation gave the best performance on the natural cooling. The first plot traveling from the lower left to the upper right is the natural convection curve of heat sink temperature rise tsa versus q.

Test results indicate that the sideward horizontal fin orientation yield the lowest heat transfer coefficient. Orientation effects on natural convection heat dissipation of rectangular fin heat sinks mounted on leds 1. You haven t mentioned if you have forced air flow i e. Thermal resistance will probably increase since it will difficult airflow i e.

The experimental setup is. Wesley lee nov 1 16 at 12 54. And the radiation is omnidirectional. Air heats and moves up if the fins are horizontal this will be hindered.