SMLease Design

Mechanical Product Design & Development Partner

Blog posts : "Heat Transfer"

Heat Sink Selection Process

With increase in heat dissipation rate and reduction in overall form factor, thermal management of electronics devices is becoming very important part of electronics product design.

Electronics chip/IC/processor  performance, reliability and life are inversely proportional to the its temperature (higher the temperature lower will be the product life). By performing product thermal analysis in initial stage of product design you can save cost and product design life-cycle time can be reduced.

Why Heat Sink Are Required

  • Heat Sinks are required to ensure the proper operation and long term reliability of heat dissipating components.
  • Heat-sinks  provide a means to dissipate the power into the surrounding ambient air and maintain a safe operating temperature.
  • Heat transfer …

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Modes Of Heat Transfer


Heat Transfer takes place from hot body to cold body. There are basically three modes of heat transfer by which heat can be transferred from hot body to cold body: Conduction, Convection & radiation. Any type of heat transfer from one body to another occurs by the combination of these three heat transfer modes. Heat transfer is one of very important aspect of product design.





Conductive heat Transfer

Conduction heat transfer is the transfer of heat between two or more bodies that are in direct contact with each other. In figure-1, transfer of heat from Face A to Face B is conductive heat transfer considering T2<T1.

Rate of conductive heat transfer is directly proportional to contact area, thermal conductivity of the material & temperature diffe…

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Effects of Anodising on radiant heat transfer in heat sink

Heat sinks cooled by natural convection may benefit from an anodized finish, but the added cost of the finish may not be justified when the part is used in forced convection cooling.

Surface emissivity limits the amount of heat transfer due to radiation cooling. With 1.0 being perfect (black body) emissivity anodized aluminum is 0.85 and unfinished is 0.05.

Heat transfer due to radiation is proportional to the heat sink surface area exposed to its surroundings and to the temperature rise above ambient (in absolute °K) raised to the 4th power (T Heat-sink Tambient)4. In natural convection on small heat sinks with open fins, and a high benefit from anodizing by up to 45%.

Relatively large extrusions and those used at low temperature rise, as in many high power applications, wil…

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