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A thin layer of graphene sprayed on the surface of the heat sink can effectively enhance heat dissipation. For parts with higher temperature, copper heat dissipation is better than aluminum. In addition, if you need to maintain a relatively low temperature, you can consider semiconductor hot spot refrigeration fins or even thermoelectric refrigeration in series. Increase the convection area to improve efficiency, and increase the radial area to reduce thermal resistance.
1. Envelope volume
2. The thickness of the bottom of the heat sink: A good bottom thickness design must be thicker from the heat source part to the edge part, so that the heat sink can absorb enough heat from the heat source part to quickly transfer to the surrounding thinner part.
3. Fin shape: a bit complicated
4. Heat sink surface treatment: Alumite or anode treatment on the heat sink surface can increase the radiation performance and increase the heat dissipation efficiency of the heat sink. Generally speaking, it has little to do with the color of white or black. The treatment of surface protrusions can increase the heat dissipation area, but in the case of natural convection, it may cause the obstruction of the air layer and reduce the efficiency.
Forced convection heat sink design
1. Increase the air velocity. This is a very direct method. It can be used with a fan with high wind speed to achieve the goal.
2. The flat fin is cross-cut to cut the flat fin into multiple short parts. Although this will reduce the heat sink surface, it will increase the thermal conductivity and increase the pressure. When the wind direction is indeterminate, this design is more appropriate.
3. Needle-shaped fin design Needle-shaped fin heat sink has the advantages of lighter weight and smaller size, but also higher volumetric efficiency, and more importantly, it is iso-directional, so it is suitable for forced convection heat sink. The shape of the fins can be divided into rectangular, round and oval. The rectangular heat sink is made of aluminum extrusion cross-cut, and the round can be forged or cast. The heat transfer of the elliptical or droplet-shaped heat sink The coefficient is higher, but it is not easy to form.
4. Impinging flow cooling uses air flow from the top of the fins to the bottom. This cooling method can increase the heat conductivity, but it must be noted that the flow direction of the wind matches the overall design.
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