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...]
Fan selection – quick techniques to compare various tube-axial fan designs
The worldwide market for tube-axial fans is very large and, as a consequence, the number of tube-axial suppliers is significant. This article will focus on the techniques that can be used to quickly compare various tube-axial fan product offerings, in order to provide a quick screen and minimize the number of suppliers that are submitted to a detailed evaluation. Supplier … [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...]
A practical formula for air-cooled boards in ventilated enclosures
Fig. 1 - Ventilated cabinet Introduction Natural air convection is commonly applied as a cooling technique for electronic equipment of moderate power density such as telecommunication boxes. The main advantage of natural convection isits intrinsic reliability, because air movement is generated simply bydensity gradients, if an external body force field exists. However, due … [Read more...]
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