The easiest way to tailor thermal conductivity of plastics is to incorporate some highly thermal conductive filler material into the plastic molding compound. Here the filler particles act as heat carriers in the thermally isolating media. Roughly, if more filler is used, then higher thermal conductivity is achieved. Phenomena related to manufacturability and strength often … [Read more...]
The thermal conductivity of unfilled plastics
This time, the focus is on the thermal conductivity of unfilled plastics. There are hundreds of them, so only a small selection can be presented. From a thermal point of view, plastics are a notoriously difficult family. Different sources show large variations in the thermal conductivity, and handbooks provide a range of values for many materials instead of a single value. The … [Read more...]
The thermal conductivity of air
In the Technical Data column of ElectronicsCooling Magazine, September 1998, the thermal conductivity of gases in general has been discussed. A few sentences were devoted to the temperature and pressure dependence of the most common gases. For example, it was stated that above 0.001 bar, the increase in thermal conductivity is of the order of magnitude of 1% per bar increase of … [Read more...]
The thermal conductivity of fluids
About 10-15 years ago, fluids, either directly (mainly Fluorocarbons), or indirectly (cold plates flushed with water) cooled the majority of mainframe computers. Nowadays, the expected increase in heat flux density causes a renewed interest in either passive or active liquid cooling, because the limits of air cooling come within reach. Other practical applications in which … [Read more...]
How Thermal Conductivity Relates to Electrical Conductivity
Because the accurate determination of thermal conductivity is a demanding task (often not recognized by either designers or vendors), methods, based on the measurement of another physical property that is uniquely coupled to thermal conductivity, are very challenging. One such method is based on the so-called Wiedemann-Franz Law, which links the thermal conductivity to the … [Read more...]
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