Abstract
Many studies on a small-sized heat sink used for cooling of small electronic parts have been reported. However, there were few studies for a large-sized heat sink used for cooling of the backlight unit of liquid crystal display device. In order to design electronic instruments, it is important that the relationship between nusselt numbers and rayleigh number is clarified. In this study, the tested heat sink was made of extruding aluminum, had fins length of 400mm, and was natural convection type heat sink. The numerical analysis on the nusselt numbers of heat sink were conducted under the various conditions, as the results, following conclusions were obtained. The equations for the natural air cooling heat sink which could predict nusselt number and the rayleigh number were proposed.
