Introduction Recent advances in mobile communications have enabled large scale development of handheld telecommunication products. Such products include cellular phones, pagers, two-way radios, personal digital assistants (PDAs), and other wireless and wireline equipment. The technological enhancements at device, package, and system levels have resulted in increased … [Read more...]
Convection and radiation
In last issue's calculation corner,a simple 1-dimensional conduction calculation was described. This time, we look at the other two basic heat transfer processes, namely convection and radiation. In actual applications with multiple heat sources with complicated geometries, the effect of each of these mechanisms on the heat transfer process can be quite difficult to calculate. … [Read more...]
Experimental evaluation of the local convective heat transfer from configurations of wall-mounted cubes in a channel flow
Figure 1: Sketches of the measurement cube. Introduction Computational fluid dynamics (CFD) codes are frequently used as design tools to predict the thermal processes in electronic circuitry. CFD codes can easily cope with a high level of complexity (component, board and system levels) which makes them attractive to use. However, the thermal and kinematic complexity of the … [Read more...]
Measuring fluid velocity in electronic enclosures
Thermal analysis and characterization of electronic systems requires a knowledge of fluid velocity. In pursuit of this information, we often resort to measurement or calculation. The issue of measurement becomes a challenge since we are dealing with rather complex flows that tend to be highly nonisothermal. Therefore, it is our intention in this article to highlight the need … [Read more...]
The coefficient of thermal expansion
This is the second technical data feature that deals with the coefficient of thermal expansion (CTE). The first technical data feature, incorporated in the September 1997 issue, covered semiconductor materials, leadframes and solder alloys. This issue will discuss the temperature dependence of the CTE and present data on other materials that are of importance to electronic … [Read more...]
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