Abstract
This paper describes an experimental study on the influence on the thermal performance of a natural air-cooling heat sink of several conditions as follows; (1) the tilt angle of the base of the one, (2) the gap between the fin tip of the one and an obstacle (or wall), and (3) surrounding air-flow velocity. As a result, the influence of these conditions for the heat sink made of aluminum with the base of 100 mm^H×50 mm^W, and with the fin of 1 mm^t, 25 mm^H and 8.5 mm^P is found.
