Heat Sink Fin Thickness

Heat sinks generally come in aspect ratios of 3 1 and 5 1.

Heat sink fin thickness. A variation of the straight fin heat sink is a cross cut heat sink where the straight fin heat sink is cut at regular intervals. Fin thickness fin height fin length fin spacing base length base width and thickness of the base plate. Calculate the thermal resistance and pressure drop of a plate fin heat sink and study how individual parameters affect the heat sink performance. The the width w of the heat sink spacing between the fins s and number of fins n will then be calculated for the selected values of l and h.

A heat sink with high aspect ratio will have either a greater density of fins in a specific footprint tall fins compared to heat sinks with less aspect ratio. Because optimum thickness aluminium heat sink fins are too soft and fragile. Notice that any old steel heat sink you see will have thinner fins than any new aluminium heat sink. Aluminium heat sinks are always made with the fins too thick.

A simple plate fin heatsink has seven independent geometric parameters that can be varied in any design. The distance between the fins. Even though the thermal conduction is worse the toughness of steel allows thinner fins. In the case presented in table 2 the total thermal resistance shows a decrease of about 15 after allowing the fin thickness to vary in the direction normal to the fluid flow.

A heat sink s aspect ratio is the comparison between the fin height. Finally the total resistance of the optimized variable thickness fin heat sink is lower than that of the optimized uniform thickness fin heat sink.