Abstract
Natural convective heat transfer on several arries of IC package type resistance elements is made clear by the experiments in silicone oil. The heat transfer characteristics are shown by the relation between Nu and Ra. Flow and temperature fields around the resistance elements are visualized by using two kinds of liquid crystal with difference temperature ranges. The velocity of fluid around the elements is measured with the path lines of liquid crystal particles. The temperature of fluid and that of element surface are measured by the thermocouples. The relation between heat transfer and flow field is examined with the visualized color pictures.
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