Some like it hot, others do not. And those others for sure include the designers of products that contain electronics. There is a growing need to educate designers who are involved with the undesired side-effects of heat-dissipating components. We often see the following situation. At some moment in time, it is ascertained that a product is getting too hot, and if it turns out … [Read more...]
Thermal Conductivity of Filled Plastics
Compared to other solid materials, metals are widely known for their superior heat transfer capabilities. However, these capabilities come at the cost of weight, coefficient of thermal expansion (CTE) mismatch and freedom of design due to manufacturing constraints. Hence, the desire for thermally-conductive plastics. On the other side of the spectrum, we would like to have … [Read more...]
Emissivity in Practical Numerical Modeling
In the August 2003 issue, the Technical Data column was devoted to emissivity in practical temperature measurements. But what about the emissivity value that should be entered in your numerical model? Can we use the measured values as discussed in the column mentioned? Let me summarize the main points of it: Emissivity is not only a material property but also a surface … [Read more...]
Heat Spreading: Not a Trivial Problem
Introduction Heat spreading is essentially area enlarging: the larger the area, the more heat can be removed at the same temperature difference (subject to certain limits). Unfortunately, except for the simplest of cases, the equations describing heat spreading physics do not have an explicit mathematical solution. Hence, we have to rely on clever approximations or suitable … [Read more...]
On The Hate/Love Relationship Between The U.S. And SI
Last year I devoted some words on correligion: the religious belief in the usefulness of correlations to solve real-life problems. I forgot to mention that correlations have one big advantage; they are dimensionless meaning that they are the same for everyone, including people from outside the US. Unfortunately this is not the case for most common units, and the struggle for … [Read more...]
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