Abstract: A heat transport device having enhanced heat transport capacity is provided. The heat transport device comprises an evacuated and sealed container 2, and phase changeable working fluid encapsulated in the container to transport heat a fiber wick 3 is laid on an inner face of the container 2 in a longitudinal direction, and a powder wick is formed on a surface of the fiber wick 3. A thickness of the powder wick is five to ten times smaller than a diameter of the fiber.

Abstract: A heat pipe having a wick structure for efficiently returning working fluid to an evaporating portion is provided. The heat pipe comprises a container 2 sealed at its both ends, a working fluid encapsulated in the container, and a wick structure 10 covering an inner face of the container. The wick structure 10 includes a porous wick 11 of a sintered metal powder, and a fiber wick 12 buried in the porous wick. A capillary pressure of the fiber wick 12 is weaker than that of the porous wick 11, and a pressure loss of the fiber wick 12 is smaller than that of the porous wick 11.

Abstract: A vapor chamber having improved heat transfer capacity by efficiently returning the working fluid to the evaporating portion is provided. A hollow flat container 2 is formed by a base member 4 and a lid 3 closing an opening of the base member. Phase-changeable working fluid is held in the container, and fins 9 are arranged in the container to transmit heat of a heat generating object between the bottom plate of the base member and the lid. The fins are densely juxtaposed on an evaporating portion in comparison with the other fins juxtaposed on the outside of the evaporating portion.