An experimental investigation was conducted for heat transfer performance of a microminiature flat heat pipe under natural and forced convection cooling. Effects of heating power and cooling intensity on the heat transfer performance of the heat pipe were analyzed. Heat transfer performance of an aluminum plate with the same dimensions was also investigated experimentally and compared. Result shows that

the flat heat pipe has good startup characteristics and uniform temperature distribution. The equivalent heat conductivity coefficient of the flat heat pipe can be 12.7 times higher than that of the aluminum plate. The flat heat pipe is convenient for large area machining with high mechanical strength

and thus has good application prospect in heat dissipation for electronic equipment.