Effect of inclination angle on the performance of a kind of vapor chamber

Abstract

Vapor chamber is an effective heat spreader for decreasing the hotspot phenomena in LED, and there are many parameters influencing its performance. In this paper, a vapor chamber was experimentally investigated. Both the thermal resistance and the temperature uniformity of the condensing surface under different inclination angles were tested. As the inclination angle changed from 0° to 50° with 10° as an interval, the maximum relative change rate of thermal resistance and temperature uniformity were 9.1% and 4.5%, respectively. And the relative standard deviations of them were 5.5% and 3.7%.